diff --git a/lib/arborist/audit.js b/lib/arborist/audit.js
index c0cd79bb1..eb4a35655 100644
--- a/lib/arborist/audit.js
+++ b/lib/arborist/audit.js
@@ -5,6 +5,7 @@ const AuditReport = require('../audit-report.js')
 // shared with reify
 const _global = Symbol.for('global')
 const _workspaces = Symbol.for('workspaces')
+const _includeWorkspaceRoot = Symbol.for('includeWorkspaceRoot')
 
 module.exports = cls => class Auditor extends cls {
   async audit (options = {}) {
@@ -23,7 +24,15 @@ module.exports = cls => class Auditor extends cls {
     process.emit('time', 'audit')
     const tree = await this.loadVirtual()
     if (this[_workspaces] && this[_workspaces].length) {
-      options.filterSet = this.workspaceDependencySet(tree, this[_workspaces])
+      options.filterSet = this.workspaceDependencySet(
+        tree,
+        this[_workspaces],
+        this[_includeWorkspaceRoot]
+      )
+    }
+    if (!options.workspacesEnabled) {
+      options.filterSet =
+        this.excludeWorkspacesDependencySet(tree)
     }
     this.auditReport = await AuditReport.load(tree, options)
     const ret = options.fix ? this.reify(options) : this.auditReport
diff --git a/lib/arborist/build-ideal-tree.js b/lib/arborist/build-ideal-tree.js
index b7876b114..3e6a9838f 100644
--- a/lib/arborist/build-ideal-tree.js
+++ b/lib/arborist/build-ideal-tree.js
@@ -93,6 +93,7 @@ const _checkEngine = Symbol('checkEngine')
 const _checkPlatform = Symbol('checkPlatform')
 const _virtualRoots = Symbol('virtualRoots')
 const _virtualRoot = Symbol('virtualRoot')
+const _includeWorkspaceRoot = Symbol.for('includeWorkspaceRoot')
 
 const _failPeerConflict = Symbol('failPeerConflict')
 const _explainPeerConflict = Symbol('explainPeerConflict')
@@ -115,12 +116,13 @@ module.exports = cls => class IdealTreeBuilder extends cls {
     options.registry = this.registry = registry.replace(/\/+$/, '') + '/'
 
     const {
-      idealTree = null,
-      global = false,
       follow = false,
+      force = false,
+      global = false,
       globalStyle = false,
+      idealTree = null,
+      includeWorkspaceRoot = false,
       legacyPeerDeps = false,
-      force = false,
       packageLock = true,
       strictPeerDeps = false,
       workspaces = [],
@@ -162,6 +164,8 @@ module.exports = cls => class IdealTreeBuilder extends cls {
     // don't hold onto references for nodes that are garbage collected.
     this[_peerSetSource] = new WeakMap()
     this[_virtualRoots] = new Map()
+
+    this[_includeWorkspaceRoot] = includeWorkspaceRoot
   }
 
   get explicitRequests () {
@@ -394,8 +398,14 @@ module.exports = cls => class IdealTreeBuilder extends cls {
     if (!this[_workspaces].length) {
       await this[_applyUserRequestsToNode](tree, options)
     } else {
-      await Promise.all(this.workspaceNodes(tree, this[_workspaces])
-        .map(node => this[_applyUserRequestsToNode](node, options)))
+      const nodes = this.workspaceNodes(tree, this[_workspaces])
+      if (this[_includeWorkspaceRoot]) {
+        nodes.push(tree)
+      }
+      const appliedRequests = nodes.map(
+        node => this[_applyUserRequestsToNode](node, options)
+      )
+      await Promise.all(appliedRequests)
     }
 
     process.emit('timeEnd', 'idealTree:userRequests')
diff --git a/lib/arborist/index.js b/lib/arborist/index.js
index d8ca67faa..ccfa7cad9 100644
--- a/lib/arborist/index.js
+++ b/lib/arborist/index.js
@@ -58,6 +58,7 @@ class Arborist extends Base {
       cache: options.cache || `${homedir()}/.npm/_cacache`,
       packumentCache: options.packumentCache || new Map(),
       log: options.log || procLog,
+      workspacesEnabled: options.workspacesEnabled !== false,
     }
     if (options.saveType && !saveTypeMap.get(options.saveType)) {
       throw new Error(`Invalid saveType ${options.saveType}`)
@@ -73,8 +74,15 @@ class Arborist extends Base {
   }
 
   // returns a set of workspace nodes and all their deps
-  workspaceDependencySet (tree, workspaces) {
+  workspaceDependencySet (tree, workspaces, includeWorkspaceRoot) {
     const wsNodes = this.workspaceNodes(tree, workspaces)
+    if (includeWorkspaceRoot) {
+      for (const edge of tree.edgesOut.values()) {
+        if (edge.type !== 'workspace' && edge.to) {
+          wsNodes.push(edge.to)
+        }
+      }
+    }
     const set = new Set(wsNodes)
     const extraneous = new Set()
     for (const node of set) {
@@ -96,6 +104,25 @@ class Arborist extends Base {
     for (const extra of extraneous) {
       set.add(extra)
     }
+
+    return set
+  }
+
+  excludeWorkspacesDependencySet (tree) {
+    const set = new Set()
+    for (const edge of tree.edgesOut.values()) {
+      if (edge.type !== 'workspace' && edge.to) {
+        set.add(edge.to)
+      }
+    }
+    for (const node of set) {
+      for (const edge of node.edgesOut.values()) {
+        if (edge.to) {
+          set.add(edge.to)
+        }
+      }
+    }
+
     return set
   }
 }
diff --git a/lib/arborist/rebuild.js b/lib/arborist/rebuild.js
index e48bdd76b..6fa5c0011 100644
--- a/lib/arborist/rebuild.js
+++ b/lib/arborist/rebuild.js
@@ -34,6 +34,7 @@ const _addToBuildSet = Symbol('addToBuildSet')
 const _checkBins = Symbol.for('checkBins')
 const _queues = Symbol('queues')
 const _scriptShell = Symbol('scriptShell')
+const _includeWorkspaceRoot = Symbol.for('includeWorkspaceRoot')
 
 const _force = Symbol.for('force')
 
@@ -77,7 +78,11 @@ module.exports = cls => class Builder extends cls {
     if (!nodes) {
       const tree = await this.loadActual()
       if (this[_workspaces] && this[_workspaces].length) {
-        const filterSet = this.workspaceDependencySet(tree, this[_workspaces])
+        const filterSet = this.workspaceDependencySet(
+          tree,
+          this[_workspaces],
+          this[_includeWorkspaceRoot]
+        )
         nodes = tree.inventory.filter(node => filterSet.has(node))
       } else {
         nodes = tree.inventory.values()
diff --git a/lib/arborist/reify.js b/lib/arborist/reify.js
index 3a9c47974..a279d8956 100644
--- a/lib/arborist/reify.js
+++ b/lib/arborist/reify.js
@@ -83,6 +83,7 @@ const _validateNodeModules = Symbol('validateNodeModules')
 const _nmValidated = Symbol('nmValidated')
 const _validatePath = Symbol('validatePath')
 const _reifyPackages = Symbol.for('reifyPackages')
+const _includeWorkspaceRoot = Symbol.for('includeWorkspaceRoot')
 
 const _omitDev = Symbol('omitDev')
 const _omitOptional = Symbol('omitOptional')
@@ -340,6 +341,15 @@ module.exports = cls => class Reifier extends cls {
           filterNodes.push(actual)
         }
       }
+      if (this[_includeWorkspaceRoot] && (this[_workspaces].length > 0)) {
+        for (const tree of [this.idealTree, this.actualTree]) {
+          for (const {type, to} of tree.edgesOut.values()) {
+            if (type !== 'workspace' && to) {
+              filterNodes.push(to)
+            }
+          }
+        }
+      }
     }
 
     // find all the nodes that need to change between the actual
@@ -901,7 +911,11 @@ module.exports = cls => class Reifier extends cls {
 
     // if we're operating on a workspace, only audit the workspace deps
     if (this[_workspaces] && this[_workspaces].length) {
-      options.filterSet = this.workspaceDependencySet(tree, this[_workspaces])
+      options.filterSet = this.workspaceDependencySet(
+        tree,
+        this[_workspaces],
+        this[_includeWorkspaceRoot]
+      )
     }
 
     this.auditReport = AuditReport.load(tree, options)
diff --git a/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs b/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
index 3142288cf..35d1d17a9 100644
--- a/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
+++ b/tap-snapshots/test/arborist/build-ideal-tree.js.test.cjs
@@ -335,6 +335,352 @@ ArboristNode {
 }
 `
 
+exports[`test/arborist/build-ideal-tree.js TAP add deps and include workspace-root add mkdirp 0.5.0 to b > must match snapshot 1`] = `
+ArboristNode {
+  "children": Map {
+    "a" => ArboristLink {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "a",
+          "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+          "type": "workspace",
+        },
+      },
+      "isWorkspace": true,
+      "location": "node_modules/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/a",
+      "realpath": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "resolved": "file:../packages/a",
+      "target": ArboristNode {
+        "location": "packages/a",
+      },
+      "version": "1.2.3",
+    },
+    "b" => ArboristLink {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "b",
+          "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+          "type": "workspace",
+        },
+      },
+      "isWorkspace": true,
+      "location": "node_modules/b",
+      "name": "b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/b",
+      "realpath": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "resolved": "file:../packages/b",
+      "target": ArboristNode {
+        "location": "packages/b",
+      },
+      "version": "1.2.3",
+    },
+    "minimist" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "minimist",
+          "spec": "1",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/minimist",
+      "name": "minimist",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/minimist",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+      "version": "1.2.5",
+    },
+    "mkdirp" => ArboristNode {
+      "children": Map {
+        "minimist" => ArboristNode {
+          "edgesIn": Set {
+            EdgeIn {
+              "from": "node_modules/mkdirp",
+              "name": "minimist",
+              "spec": "0.0.8",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/mkdirp/node_modules/minimist",
+          "name": "minimist",
+          "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/mkdirp/node_modules/minimist",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "version": "0.0.8",
+        },
+      },
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "mkdirp",
+          "spec": "0.5.0",
+          "type": "prod",
+        },
+        EdgeIn {
+          "from": "packages/a",
+          "name": "mkdirp",
+          "spec": "^0.5.0",
+          "type": "prod",
+        },
+        EdgeIn {
+          "from": "packages/b",
+          "name": "mkdirp",
+          "spec": "0.5.0",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "minimist" => EdgeOut {
+          "name": "minimist",
+          "spec": "0.0.8",
+          "to": "node_modules/mkdirp/node_modules/minimist",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/mkdirp",
+      "name": "mkdirp",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/mkdirp",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.0.tgz",
+      "version": "0.5.0",
+    },
+  },
+  "edgesOut": Map {
+    "a" => EdgeOut {
+      "name": "a",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "to": "node_modules/a",
+      "type": "workspace",
+    },
+    "b" => EdgeOut {
+      "name": "b",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "to": "node_modules/b",
+      "type": "workspace",
+    },
+    "minimist" => EdgeOut {
+      "name": "minimist",
+      "spec": "1",
+      "to": "node_modules/minimist",
+      "type": "prod",
+    },
+    "mkdirp" => EdgeOut {
+      "name": "mkdirp",
+      "spec": "0.5.0",
+      "to": "node_modules/mkdirp",
+      "type": "prod",
+    },
+  },
+  "fsChildren": Set {
+    ArboristNode {
+      "edgesOut": Map {
+        "mkdirp" => EdgeOut {
+          "name": "mkdirp",
+          "spec": "^0.5.0",
+          "to": "node_modules/mkdirp",
+          "type": "prod",
+        },
+      },
+      "isWorkspace": true,
+      "location": "packages/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "version": "1.2.3",
+    },
+    ArboristNode {
+      "edgesOut": Map {
+        "mkdirp" => EdgeOut {
+          "name": "mkdirp",
+          "spec": "0.5.0",
+          "to": "node_modules/mkdirp",
+          "type": "prod",
+        },
+      },
+      "isWorkspace": true,
+      "location": "packages/b",
+      "name": "b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "version": "1.2.3",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root",
+  "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root",
+  "workspaces": Map {
+    "a" => "packages/a",
+    "b" => "packages/b",
+  },
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP add deps and include workspace-root no args > must match snapshot 1`] = `
+ArboristNode {
+  "children": Map {
+    "a" => ArboristLink {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "a",
+          "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+          "type": "workspace",
+        },
+      },
+      "isWorkspace": true,
+      "location": "node_modules/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/a",
+      "realpath": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "resolved": "file:../packages/a",
+      "target": ArboristNode {
+        "location": "packages/a",
+      },
+      "version": "1.2.3",
+    },
+    "b" => ArboristLink {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "b",
+          "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+          "type": "workspace",
+        },
+      },
+      "isWorkspace": true,
+      "location": "node_modules/b",
+      "name": "b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/b",
+      "realpath": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "resolved": "file:../packages/b",
+      "target": ArboristNode {
+        "location": "packages/b",
+      },
+      "version": "1.2.3",
+    },
+    "minimist" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "minimist",
+          "spec": "1",
+          "type": "prod",
+        },
+        EdgeIn {
+          "from": "packages/a/node_modules/mkdirp",
+          "name": "minimist",
+          "spec": "^1.2.5",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/minimist",
+      "name": "minimist",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/minimist",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+      "version": "1.2.5",
+    },
+    "mkdirp" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "mkdirp",
+          "spec": "^1.0.4",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/mkdirp",
+      "name": "mkdirp",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/node_modules/mkdirp",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+      "version": "1.0.4",
+    },
+  },
+  "edgesOut": Map {
+    "a" => EdgeOut {
+      "name": "a",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "to": "node_modules/a",
+      "type": "workspace",
+    },
+    "b" => EdgeOut {
+      "name": "b",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "to": "node_modules/b",
+      "type": "workspace",
+    },
+    "minimist" => EdgeOut {
+      "name": "minimist",
+      "spec": "1",
+      "to": "node_modules/minimist",
+      "type": "prod",
+    },
+    "mkdirp" => EdgeOut {
+      "name": "mkdirp",
+      "spec": "^1.0.4",
+      "to": "node_modules/mkdirp",
+      "type": "prod",
+    },
+  },
+  "fsChildren": Set {
+    ArboristNode {
+      "children": Map {
+        "mkdirp" => ArboristNode {
+          "edgesIn": Set {
+            EdgeIn {
+              "from": "packages/a",
+              "name": "mkdirp",
+              "spec": "^0.5.0",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "minimist" => EdgeOut {
+              "name": "minimist",
+              "spec": "^1.2.5",
+              "to": "node_modules/minimist",
+              "type": "prod",
+            },
+          },
+          "location": "packages/a/node_modules/mkdirp",
+          "name": "mkdirp",
+          "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a/node_modules/mkdirp",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "version": "0.5.5",
+        },
+      },
+      "edgesOut": Map {
+        "mkdirp" => EdgeOut {
+          "name": "mkdirp",
+          "spec": "^0.5.0",
+          "to": "packages/a/node_modules/mkdirp",
+          "type": "prod",
+        },
+      },
+      "isWorkspace": true,
+      "location": "packages/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/a",
+      "version": "1.2.3",
+    },
+    ArboristNode {
+      "isWorkspace": true,
+      "location": "packages/b",
+      "name": "b",
+      "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root/packages/b",
+      "version": "1.2.3",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root",
+  "path": "{CWD}/test/arborist/tap-testdir-build-ideal-tree-add-deps-and-include-workspace-root",
+  "workspaces": Map {
+    "a" => "packages/a",
+    "b" => "packages/b",
+  },
+}
+`
+
 exports[`test/arborist/build-ideal-tree.js TAP add deps to workspaces KEEP in the root, prune out unnecessary dupe > must match snapshot 1`] = `
 ArboristNode {
   "children": Map {
diff --git a/tap-snapshots/test/arborist/load-virtual.js.test.cjs b/tap-snapshots/test/arborist/load-virtual.js.test.cjs
index ec4d0bbbb..c0210aabc 100644
--- a/tap-snapshots/test/arborist/load-virtual.js.test.cjs
+++ b/tap-snapshots/test/arborist/load-virtual.js.test.cjs
@@ -16714,6 +16714,29 @@ ArboristNode {
       },
       "version": "1.0.0",
     },
+    "once" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "once",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "wrappy" => EdgeOut {
+          "name": "wrappy",
+          "spec": "1",
+          "to": "node_modules/wrappy",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/once",
+      "name": "once",
+      "path": "{CWD}/test/fixtures/workspaces-shared-deps-virtual/node_modules/once",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "version": "1.4.0",
+    },
     "uuid" => ArboristNode {
       "edgesIn": Set {
         EdgeIn {
@@ -16729,6 +16752,21 @@ ArboristNode {
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "version": "3.3.3",
     },
+    "wrappy" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "node_modules/once",
+          "name": "wrappy",
+          "spec": "1",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/wrappy",
+      "name": "wrappy",
+      "path": "{CWD}/test/fixtures/workspaces-shared-deps-virtual/node_modules/wrappy",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "version": "1.0.2",
+    },
   },
   "edgesOut": Map {
     "a" => EdgeOut {
@@ -16749,6 +16787,12 @@ ArboristNode {
       "to": "node_modules/c",
       "type": "workspace",
     },
+    "once" => EdgeOut {
+      "name": "once",
+      "spec": "*",
+      "to": "node_modules/once",
+      "type": "prod",
+    },
   },
   "fsChildren": Set {
     ArboristNode {
diff --git a/tap-snapshots/test/arborist/reify.js.test.cjs b/tap-snapshots/test/arborist/reify.js.test.cjs
index 109d5829c..fbd6c3b01 100644
--- a/tap-snapshots/test/arborist/reify.js.test.cjs
+++ b/tap-snapshots/test/arborist/reify.js.test.cjs
@@ -4177,6 +4177,132 @@ ArboristNode {
 }
 `
 
+exports[`test/arborist/reify.js TAP includeWorkspaceRoot in addition to workspace > must match snapshot 1`] = `
+ArboristNode {
+  "children": Map {
+    "a" => ArboristLink {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "a",
+          "spec": "file:{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/packages/a",
+          "type": "workspace",
+        },
+      },
+      "isWorkspace": true,
+      "location": "node_modules/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/node_modules/a",
+      "realpath": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/packages/a",
+      "resolved": "file:../packages/a",
+      "target": ArboristNode {
+        "location": "packages/a",
+      },
+      "version": "1.0.1",
+    },
+    "abbrev" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "packages/a",
+          "name": "abbrev",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/abbrev",
+      "name": "abbrev",
+      "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/node_modules/abbrev",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "version": "1.1.1",
+    },
+    "once" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "",
+          "name": "once",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "wrappy" => EdgeOut {
+          "name": "wrappy",
+          "spec": "1",
+          "to": "node_modules/wrappy",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/once",
+      "name": "once",
+      "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/node_modules/once",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "version": "1.4.0",
+    },
+    "wrappy" => ArboristNode {
+      "edgesIn": Set {
+        EdgeIn {
+          "from": "node_modules/once",
+          "name": "wrappy",
+          "spec": "1",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/wrappy",
+      "name": "wrappy",
+      "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/node_modules/wrappy",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "version": "1.0.2",
+    },
+  },
+  "edgesOut": Map {
+    "a" => EdgeOut {
+      "name": "a",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/packages/a",
+      "to": "node_modules/a",
+      "type": "workspace",
+    },
+    "b" => EdgeOut {
+      "error": "MISSING",
+      "name": "b",
+      "spec": "file:{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/packages/b",
+      "to": null,
+      "type": "workspace",
+    },
+    "once" => EdgeOut {
+      "name": "once",
+      "spec": "*",
+      "to": "node_modules/once",
+      "type": "prod",
+    },
+  },
+  "fsChildren": Set {
+    ArboristNode {
+      "edgesOut": Map {
+        "abbrev" => EdgeOut {
+          "name": "abbrev",
+          "spec": "*",
+          "to": "node_modules/abbrev",
+          "type": "prod",
+        },
+      },
+      "isWorkspace": true,
+      "location": "packages/a",
+      "name": "a",
+      "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace/packages/a",
+      "version": "1.0.1",
+    },
+  },
+  "isProjectRoot": true,
+  "location": "",
+  "name": "tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace",
+  "path": "{CWD}/test/arborist/tap-testdir-reify-includeWorkspaceRoot-in-addition-to-workspace",
+  "workspaces": Map {
+    "a" => "packages/a",
+    "b" => "packages/b",
+  },
+}
+`
+
 exports[`test/arborist/reify.js TAP just the shrinkwrap cli-750-fresh > must match snapshot 1`] = `
 {
   "name": "monorepo",
diff --git a/test/arborist/audit.js b/test/arborist/audit.js
index 56dfe992b..2ff5c5341 100644
--- a/test/arborist/audit.js
+++ b/test/arborist/audit.js
@@ -107,3 +107,48 @@ t.test('audit in a workspace', async t => {
   t.equal(fixed.children.get('a').target.children.get('mkdirp').version, '0.5.0', 'did not fix a')
   t.equal(fixed.children.get('b').target.children.get('mkdirp').version, '0.5.5', 'did fix b')
 })
+
+t.test('audit with workspaces disabled', async t => {
+  const src = resolve(fixtures, 'audit-nyc-mkdirp')
+  const auditFile = resolve(src, 'advisory-bulk.json')
+  t.teardown(advisoryBulkResponse(auditFile))
+
+  const path = t.testdir({
+    'package.json': JSON.stringify({
+      workspaces: ['packages/*'],
+      dependencies: {
+        mkdirp: '1',
+      },
+    }),
+    packages: {
+      a: {
+        'package.json': JSON.stringify({
+          name: 'a',
+          version: '1.2.3',
+          dependencies: {
+            mkdirp: '0',
+          },
+        }),
+      },
+      b: {
+        'package.json': JSON.stringify({
+          name: 'b',
+          version: '1.2.3',
+          dependencies: {
+            mkdirp: '0',
+          },
+        }),
+      },
+    },
+  })
+
+  // reify it without auditing so that we can put the "bad" versions
+  // in place and save a lockfile reflecting this.
+  await newArb(path, { audit: false }).reify()
+  const bad = 'mkdirp@0.5.0'
+  await newArb(path, { audit: false, workspaces: ['a'] }).reify({ add: [bad] })
+  await newArb(path, { audit: false, workspaces: ['b'] }).reify({ add: [bad] })
+
+  const auditReport = await newArb(path, { workspacesEnabled: false }).audit()
+  t.notOk(auditReport.get('mkdirp'))
+})
diff --git a/test/arborist/build-ideal-tree.js b/test/arborist/build-ideal-tree.js
index 40e0c7d7a..dfb1a77f9 100644
--- a/test/arborist/build-ideal-tree.js
+++ b/test/arborist/build-ideal-tree.js
@@ -2601,6 +2601,54 @@ t.test('add deps to workspaces', async t => {
   })
 })
 
+t.test('add deps and include workspace-root', async t => {
+  const fixtureDef = {
+    'package.json': JSON.stringify({
+      workspaces: [
+        'packages/*',
+      ],
+      dependencies: {
+        mkdirp: '^1.0.4',
+        minimist: '1',
+      },
+    }),
+    packages: {
+      a: {
+        'package.json': JSON.stringify({
+          name: 'a',
+          version: '1.2.3',
+          dependencies: {
+            mkdirp: '^0.5.0',
+          },
+        }),
+      },
+      b: {
+        'package.json': JSON.stringify({
+          name: 'b',
+          version: '1.2.3',
+        }),
+      },
+    },
+  }
+  const path = t.testdir(fixtureDef)
+
+  t.test('no args', async t => {
+    const tree = await buildIdeal(path)
+    t.equal(tree.children.get('mkdirp').version, '1.0.4')
+    t.equal(tree.children.get('a').target.children.get('mkdirp').version, '0.5.5')
+    t.equal(tree.children.get('b').target.children.get('mkdirp'), undefined)
+    t.ok(tree.edgesOut.has('mkdirp'))
+    t.matchSnapshot(printTree(tree))
+  })
+
+  t.test('add mkdirp 0.5.0 to b', async t => {
+    const tree = await buildIdeal(path, { workspaces: ['b'], add: ['mkdirp@0.5.0'], includeWorkspaceRoot: true })
+    t.equal(tree.children.get('mkdirp').version, '0.5.0')
+    t.ok(tree.edgesOut.has('mkdirp'))
+    t.matchSnapshot(printTree(tree))
+  })
+})
+
 t.test('inflates old lockfile with hasInstallScript', async t => {
   const path = t.testdir({
     'package-lock.json': JSON.stringify({
diff --git a/test/arborist/index.js b/test/arborist/index.js
index b7b04c8be..0237c3fe9 100644
--- a/test/arborist/index.js
+++ b/test/arborist/index.js
@@ -42,6 +42,24 @@ t.test('workspace nodes and deps', async t => {
     t.equal(wsDepSet.has(tree.children.get('abbrev')), true)
   }
 
+  {
+    const wsDepSet = arb.workspaceDependencySet(tree, ['b'], true)
+    t.equal(wsDepSet.size, 4)
+    t.equal(wsDepSet.has(tree.children.get('b').target), true)
+    t.equal(wsDepSet.has(tree.children.get('abbrev')), true)
+    t.equal(wsDepSet.has(tree.children.get('once')), true)
+    t.equal(wsDepSet.has(tree.children.get('wrappy')), true)
+  }
+
+  {
+    const wsDepSet = arb.excludeWorkspacesDependencySet(tree)
+    t.equal(wsDepSet.size, 2)
+    t.equal(wsDepSet.has(tree.children.get('b').target), false)
+    t.equal(wsDepSet.has(tree.children.get('abbrev')), false)
+    t.equal(wsDepSet.has(tree.children.get('once')), true)
+    t.equal(wsDepSet.has(tree.children.get('wrappy')), true)
+  }
+
   const wsNode = wsNodes[0]
   new Edge({
     from: wsNode,
@@ -105,3 +123,99 @@ t.test('workspace nodes and deps', async t => {
     t.equal(wsDepSet.has(tree.children.get('abbrev').target), true)
   }
 })
+
+t.test('excludeSet includes nonworkspace metadeps', async t => {
+  const tree = new Node({
+    path: '/hi',
+    pkg: {
+      workspaces: ['pkgs/*'],
+      dependencies: {
+        foo: '',
+      },
+    },
+    children: [
+      {
+        pkg: {
+          name: 'foo',
+          version: '0.1.1',
+          dependencies: {
+            bar: '',
+            asdf: '',
+          },
+        },
+      },
+      {
+        pkg: {
+          name: 'bar',
+          version: '0.2.0',
+        },
+      },
+      {
+        pkg: {
+          name: 'baz',
+          version: '9.2.0',
+        },
+      },
+      {
+        pkg: {
+          name: 'fritzy',
+          version: '2.2.9',
+          optionalDependencies: {
+            isaacs: '',
+          },
+        },
+      },
+    ],
+  })
+  const pkgA = new Node({
+    path: tree.path + '/pkgs/a',
+    pkg: {
+      name: 'a',
+      version: '1.0.0',
+      dependencies: {
+        baz: '',
+      },
+    },
+    root: tree,
+  })
+  new Link({
+    name: 'a',
+    parent: tree,
+    target: pkgA,
+  })
+  new Edge({
+    type: 'workspace',
+    from: tree,
+    name: 'a',
+    spec: 'file:pkgs/a',
+  })
+  const pkgB = new Node({
+    path: tree.path + '/pkgs/b',
+    pkg: {
+      name: 'b',
+      version: '1.0.0',
+      dependencies: {
+        fritzy: '',
+      },
+    },
+    root: tree,
+  })
+  new Link({
+    name: 'b',
+    parent: tree,
+    target: pkgB,
+  })
+  new Edge({
+    type: 'workspace',
+    from: tree,
+    name: 'b',
+    spec: 'file:pkgs/b',
+  })
+
+  const arb = new Arborist()
+  const filter = arb.excludeWorkspacesDependencySet(tree)
+
+  t.equal(filter.size, 2)
+  t.equal(filter.has(tree.children.get('foo')), true)
+  t.equal(filter.has(tree.children.get('bar')), true)
+})
diff --git a/test/arborist/reify.js b/test/arborist/reify.js
index 5a544d7b9..e058fee3f 100644
--- a/test/arborist/reify.js
+++ b/test/arborist/reify.js
@@ -2324,3 +2324,39 @@ t.test('adding an unresolvable optional dep is OK', async t => {
   t.strictSame([...tree.children.values()], [], 'nothing actually added')
   t.matchSnapshot(printTree(tree))
 })
+
+t.test('includeWorkspaceRoot in addition to workspace', async t => {
+  const path = t.testdir({
+    'package.json': JSON.stringify({
+      dependencies: {
+        once: '',
+      },
+      workspaces: ['packages/*'],
+    }),
+    packages: {
+      a: {
+        'package.json': JSON.stringify({
+          name: 'a',
+          version: '1.0.1',
+          dependencies: {
+            abbrev: '',
+          },
+        }),
+      },
+      b: {
+        'package.json': JSON.stringify({
+          name: 'b',
+          version: '9.8.1',
+          dependencies: {
+            semver: '',
+          },
+        }),
+      },
+    },
+  })
+  const tree = await reify(path, { includeWorkspaceRoot: true, workspaces: ['a'] })
+  t.matchSnapshot(printTree(tree))
+  t.equal(tree.inventory.query('name', 'semver').size, 0)
+  t.equal(tree.inventory.query('name', 'abbrev').size, 1)
+  t.equal(tree.inventory.query('name', 'once').size, 1)
+})
diff --git a/test/fixtures/workspaces-shared-deps-virtual/package-lock.json b/test/fixtures/workspaces-shared-deps-virtual/package-lock.json
index 3d77c2f42..8dc30e012 100644
--- a/test/fixtures/workspaces-shared-deps-virtual/package-lock.json
+++ b/test/fixtures/workspaces-shared-deps-virtual/package-lock.json
@@ -7,10 +7,11 @@
     "": {
       "name": "workspaces-shared-deps",
       "version": "1.0.0",
-      "workspaces": {
-        "packages": [
-          "packages/*"
-        ]
+      "workspaces": [
+        "packages/*"
+      ],
+      "dependencies": {
+        "once": ""
       }
     },
     "node_modules/a": {
@@ -18,7 +19,6 @@
       "link": true
     },
     "node_modules/abbrev": {
-      "name": "abbrev",
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
@@ -31,31 +31,41 @@
       "resolved": "packages/c",
       "link": true
     },
+    "node_modules/once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dependencies": {
+        "wrappy": "1"
+      }
+    },
     "node_modules/uuid": {
-      "name": "uuid",
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "deprecated": "Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.",
       "bin": {
         "uuid": "bin/uuid"
       }
     },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
     "packages/a": {
-      "name": "a",
       "version": "1.0.0",
       "dependencies": {
         "abbrev": "^1.1.1"
       }
     },
     "packages/b": {
-      "name": "b",
       "version": "1.0.0",
       "dependencies": {
         "abbrev": "^1.1.1"
       }
     },
     "packages/c": {
-      "name": "c",
       "version": "1.0.0",
       "dependencies": {
         "uuid": "=3.3.3"
@@ -64,7 +74,10 @@
   },
   "dependencies": {
     "a": {
-      "version": "file:packages/a"
+      "version": "file:packages/a",
+      "requires": {
+        "abbrev": "^1.1.1"
+      }
     },
     "abbrev": {
       "version": "1.1.1",
@@ -72,15 +85,34 @@
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
     },
     "b": {
-      "version": "file:packages/b"
+      "version": "file:packages/b",
+      "requires": {
+        "abbrev": "^1.1.1"
+      }
     },
     "c": {
-      "version": "file:packages/c"
+      "version": "file:packages/c",
+      "requires": {
+        "uuid": "=3.3.3"
+      }
+    },
+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "requires": {
+        "wrappy": "1"
+      }
     },
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     }
   }
 }
diff --git a/test/fixtures/workspaces-shared-deps-virtual/package.json b/test/fixtures/workspaces-shared-deps-virtual/package.json
index 4c634a1e0..9cf60d751 100644
--- a/test/fixtures/workspaces-shared-deps-virtual/package.json
+++ b/test/fixtures/workspaces-shared-deps-virtual/package.json
@@ -3,5 +3,8 @@
   "version": "1.0.0",
   "workspaces": [
     "packages/*"
-  ]
+  ],
+  "dependencies": {
+    "once": ""
+  }
 }