diff --git a/README.md b/README.md
index 9f71fcd..8abc385 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ npm install --global git-garbage
   <br>
 </p>
 
+A branch checked out in a linked worktree is removed together with its worktree. It is skipped when that worktree has uncommitted changes, is locked, or is the main checkout.
+
 ## Related 
 
 * [git-dirty](https://github.com/Kikobeats/git-dirty#git-dirty) – Ensures the working directory is clean and that there are no unpulled changes.
diff --git a/garbage.sh b/garbage.sh
index eee256d..ee62bad 100755
--- a/garbage.sh
+++ b/garbage.sh
@@ -10,10 +10,31 @@ if ! git fetch --prune --quiet 2> /dev/null; then
   exit 1;
 fi
 
+git worktree prune
+
 current="$(git rev-parse --abbrev-ref HEAD)"
+worktree_list="$(git worktree list --porcelain)"
+main_worktree="$(printf '%s\n' "$worktree_list" | awk 'NR == 1 { print substr($0, 10) }')"
 
 declare -a branches
 
+# Print the path of the worktree that has the branch checked out, if any
+worktree_of() {
+  printf '%s\n' "$worktree_list" | awk -v ref="refs/heads/$1" '
+    /^worktree / { path = substr($0, 10) }
+    $0 == "branch " ref { print path; exit }
+  '
+}
+
+is_locked_worktree() {
+  printf '%s\n' "$worktree_list" | awk -v entry="worktree $1" '
+    $0 == entry { inside = 1; next }
+    inside && /^locked/ { locked = 1; exit }
+    inside && NF == 0 { exit }
+    END { exit locked ? 0 : 1 }
+  '
+}
+
 # Check if a branch was part of remote workflow (pushed at some point)
 was_pushed() {
   local branch="$1"
@@ -83,19 +104,60 @@ if command -v gh &> /dev/null && gh auth status &> /dev/null; then
   fi
 fi
 
-if [[ ${#branches[@]} -eq 0 ]]; then
+# branches checked out in another worktree go with their worktree, unless it has work in it
+declare -a removable worktrees skipped
+for branch in "${branches[@]}"; do
+  worktree="$(worktree_of "$branch")"
+  if [[ -z "$worktree" ]]; then
+    removable+=("$branch")
+    worktrees+=("")
+  elif [[ "$worktree" == "$main_worktree" ]]; then
+    skipped+=("$branch (checked out in main worktree $worktree)")
+  elif is_locked_worktree "$worktree"; then
+    skipped+=("$branch (locked worktree $worktree)")
+  elif [[ -n "$(git -C "$worktree" status --porcelain 2> /dev/null)" ]]; then
+    skipped+=("$branch (uncommitted changes in worktree $worktree)")
+  else
+    removable+=("$branch")
+    worktrees+=("$worktree")
+  fi
+done
+
+if [[ ${#skipped[@]} -gt 0 ]]; then
+  echo
+  printf '  skipped %s\n' "${skipped[@]}"
+fi
+
+if [[ ${#removable[@]} -eq 0 ]]; then
   printf "\n  Nothing to garbage."
   exit
 fi
 
 echo
-printf '  %s\n' "${branches[@]}"
+for i in "${!removable[@]}"; do
+  if [[ -n "${worktrees[$i]}" ]]; then
+    printf '  %s (and worktree %s)\n' "${removable[$i]}" "${worktrees[$i]}"
+  else
+    printf '  %s\n' "${removable[$i]}"
+  fi
+done
 echo
 
 read -rp "  Will be removed. Continue? (y/N) " -n 1
 
 if [[ $REPLY =~ ^[Yy]$ ]]; then
   echo && echo
-  message=$(git branch -D "${branches[@]}")
-  echo "${message//Deleted/  Deleted}"
+  declare -a deletable
+  for i in "${!removable[@]}"; do
+    if [[ -z "${worktrees[$i]}" ]]; then
+      deletable+=("${removable[$i]}")
+    elif git worktree remove "${worktrees[$i]}"; then
+      echo "  Removed worktree ${worktrees[$i]}"
+      deletable+=("${removable[$i]}")
+    fi
+  done
+  if [[ ${#deletable[@]} -gt 0 ]]; then
+    message=$(git branch -D "${deletable[@]}")
+    echo "${message//Deleted/  Deleted}"
+  fi
 fi
diff --git a/package.json b/package.json
index db853ad..352c58f 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "release": "standard-version -a",
     "release:github": "github-generate-release",
     "release:tags": "git push --follow-tags origin HEAD:master",
-    "test": "exit 0"
+    "test": "bash test.sh"
   },
   "license": "MIT",
   "commitlint": {
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..0c8ced2
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,139 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+GARBAGE="${GARBAGE:-$(cd "$(dirname "$0")" && pwd)/garbage.sh}"
+SANDBOX="$(mktemp -d)"
+trap 'rm -rf "$SANDBOX"' EXIT
+
+failures=0
+
+assert() {
+  local message="$1"
+  shift
+  if "$@"; then
+    echo "  ✔ $message"
+  else
+    echo "  ✖ $message" >&2
+    printf '%s\n' "${output:-}" >&2
+    failures=$((failures + 1))
+  fi
+}
+
+refute() {
+  local message="$1"
+  shift
+  if "$@"; then
+    echo "  ✖ $message" >&2
+    printf '%s\n' "${output:-}" >&2
+    failures=$((failures + 1))
+  else
+    echo "  ✔ $message"
+  fi
+}
+
+contains() {
+  case "$1" in
+    *"$2"*) return 0 ;;
+    *) return 1 ;;
+  esac
+}
+
+without_gh() {
+  mkdir -p "$SANDBOX/bin"
+  printf '#!/bin/sh\nexit 1\n' > "$SANDBOX/bin/gh"
+  chmod +x "$SANDBOX/bin/gh"
+  PATH="$SANDBOX/bin:$PATH"
+}
+
+git_quiet() {
+  if ! git -c init.defaultBranch=master -c user.name=test -c user.email=test@test "$@" > /dev/null 2>&1; then
+    echo "  fixture failed: git $*" >&2
+    exit 1
+  fi
+}
+
+create_repo() {
+  local name="$1"
+  git_quiet init --bare "$SANDBOX/$name.git"
+  git_quiet clone "$SANDBOX/$name.git" "$SANDBOX/$name"
+  git_quiet -C "$SANDBOX/$name" commit --allow-empty -m init
+  git_quiet -C "$SANDBOX/$name" push -u origin master
+}
+
+merge_pushed_branch() {
+  local repo="$1" branch="$2"
+  git_quiet -C "$repo" switch -c "$branch"
+  git_quiet -C "$repo" commit --allow-empty -m "$branch"
+  git_quiet -C "$repo" push -u origin "$branch"
+  git_quiet -C "$repo" switch master
+  git_quiet -C "$repo" merge --ff-only "$branch"
+  git_quiet -C "$repo" push origin master
+  git_quiet -C "$repo" push origin --delete "$branch"
+}
+
+branch_exists() {
+  git -C "$1" show-ref --verify --quiet "refs/heads/$2"
+}
+
+run_garbage() {
+  (cd "$1" && printf 'y' | bash "$GARBAGE" 2>&1)
+}
+
+without_gh
+
+echo "merged branch checked out in a clean linked worktree"
+create_repo clean
+merge_pushed_branch "$SANDBOX/clean" feature
+git_quiet -C "$SANDBOX/clean" worktree add "$SANDBOX/clean-wt" feature
+output="$(run_garbage "$SANDBOX/clean")"
+refute "branch deleted" branch_exists "$SANDBOX/clean" feature
+refute "worktree removed" test -d "$SANDBOX/clean-wt"
+refute "no git error" contains "$output" "cannot delete branch"
+
+echo "merged branch checked out in a dirty linked worktree"
+create_repo dirty
+merge_pushed_branch "$SANDBOX/dirty" feature
+git_quiet -C "$SANDBOX/dirty" worktree add "$SANDBOX/dirty-wt" feature
+touch "$SANDBOX/dirty-wt/wip.txt"
+output="$(run_garbage "$SANDBOX/dirty")"
+assert "branch kept" branch_exists "$SANDBOX/dirty" feature
+assert "worktree kept" test -f "$SANDBOX/dirty-wt/wip.txt"
+assert "skip reason printed" contains "$output" "uncommitted changes"
+
+echo "merged branch checked out in a locked worktree"
+create_repo locked
+merge_pushed_branch "$SANDBOX/locked" feature
+git_quiet -C "$SANDBOX/locked" worktree add "$SANDBOX/locked-wt" feature
+git_quiet -C "$SANDBOX/locked" worktree lock "$SANDBOX/locked-wt"
+output="$(run_garbage "$SANDBOX/locked")"
+assert "branch kept" branch_exists "$SANDBOX/locked" feature
+assert "worktree kept" test -d "$SANDBOX/locked-wt"
+assert "skip reason printed" contains "$output" "locked worktree"
+refute "not announced for removal" contains "$output" "and worktree"
+
+echo "run from a linked worktree never touches the main checkout branch"
+create_repo linked
+merge_pushed_branch "$SANDBOX/linked" feature
+git_quiet -C "$SANDBOX/linked" worktree add "$SANDBOX/linked-wt" feature
+output="$(run_garbage "$SANDBOX/linked-wt")"
+assert "main checkout branch kept" branch_exists "$SANDBOX/linked" master
+assert "main checkout kept" test -d "$SANDBOX/linked"
+
+echo "merged branch without worktree"
+create_repo plain
+merge_pushed_branch "$SANDBOX/plain" feature
+output="$(run_garbage "$SANDBOX/plain")"
+refute "branch deleted" branch_exists "$SANDBOX/plain" feature
+
+echo "stale worktree whose directory is gone"
+create_repo stale
+merge_pushed_branch "$SANDBOX/stale" feature
+git_quiet -C "$SANDBOX/stale" worktree add "$SANDBOX/stale-wt" feature
+rm -rf "$SANDBOX/stale-wt"
+output="$(run_garbage "$SANDBOX/stale")"
+refute "branch deleted" branch_exists "$SANDBOX/stale" feature
+
+if [[ $failures -gt 0 ]]; then
+  echo && echo "$failures failure(s)" >&2
+  exit 1
+fi