diff --git a/frontend/src/components/library/TreeGridView.tsx b/frontend/src/components/library/TreeGridView.tsx
index bc9dd1f1..dd1a3c1c 100644
--- a/frontend/src/components/library/TreeGridView.tsx
+++ b/frontend/src/components/library/TreeGridView.tsx
@@ -52,6 +52,11 @@ export function TreeGridView({
                   Maintenance
                 </span>
               )}
+              {'fork_info' in tree && Boolean((tree as Record<string, unknown>).fork_info) && (
+                <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
+                  Fork
+                </span>
+              )}
             </div>
             <div className="flex items-center gap-2">
               {onTogglePin && (
diff --git a/frontend/src/components/library/TreeListView.tsx b/frontend/src/components/library/TreeListView.tsx
index 6f94eb7f..d6e201c2 100644
--- a/frontend/src/components/library/TreeListView.tsx
+++ b/frontend/src/components/library/TreeListView.tsx
@@ -53,6 +53,11 @@ export function TreeListView({
                   Maintenance
                 </span>
               )}
+              {'fork_info' in tree && Boolean((tree as Record<string, unknown>).fork_info) && (
+                <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
+                  Fork
+                </span>
+              )}
               {tree.is_public ? (
                 <span title="Public tree">
                   <Globe className="h-3.5 w-3.5 text-muted-foreground flex-shrink-0" />
diff --git a/frontend/src/components/library/TreeTableView.tsx b/frontend/src/components/library/TreeTableView.tsx
index b39ac257..dd18c0b2 100644
--- a/frontend/src/components/library/TreeTableView.tsx
+++ b/frontend/src/components/library/TreeTableView.tsx
@@ -182,6 +182,11 @@ export function TreeTableView({
                       Maintenance
                     </span>
                   )}
+                  {'fork_info' in tree && Boolean((tree as Record<string, unknown>).fork_info) && (
+                    <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
+                      Fork
+                    </span>
+                  )}
                   {tree.is_public ? (
                     <span title="Public tree">
                       <Globe className="h-3.5 w-3.5 text-muted-foreground flex-shrink-0" />
diff --git a/frontend/src/pages/MyTreesPage.tsx b/frontend/src/pages/MyTreesPage.tsx
index 620d3a50..b59f3d1b 100644
--- a/frontend/src/pages/MyTreesPage.tsx
+++ b/frontend/src/pages/MyTreesPage.tsx
@@ -257,6 +257,11 @@ export function MyTreesPage() {
                     <Wrench className="h-4 w-4 shrink-0 text-amber-400" />
                   )}
                   <h3 className="font-semibold text-foreground">{tree.name}</h3>
+                  {tree.parent_tree_id && (
+                    <span className="shrink-0 rounded-full bg-violet-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-violet-400">
+                      Fork
+                    </span>
+                  )}
                 </div>
                 <div className="flex items-center gap-1.5">
                   {tree.tree_type === 'procedural' && (