diff --git a/server/community-store.ts b/server/community-store.ts
index 9107b43..69fdf5c 100644
--- a/server/community-store.ts
+++ b/server/community-store.ts
@@ -884,6 +884,23 @@ export function clearShapes(slug: string): void {
 	if (doc) {
 		const newDoc = Automerge.change(doc, "Clear all shapes", (d) => {
 			d.shapes = {};
+			// Reset seeded flag so demo reset can re-seed
+			(d.meta as any).shapesSeeded = false;
+		});
+		communities.set(slug, newDoc);
+		saveCommunity(slug);
+	}
+}
+
+/**
+ * Mark a community as having been seeded with shapes.
+ * Prevents re-seeding after users delete all content.
+ */
+export function markShapesSeeded(slug: string): void {
+	const doc = communities.get(slug);
+	if (doc) {
+		const newDoc = Automerge.change(doc, "Mark shapes seeded", (d) => {
+			(d.meta as any).shapesSeeded = true;
 		});
 		communities.set(slug, newDoc);
 		saveCommunity(slug);
diff --git a/server/seed-campaign.ts b/server/seed-campaign.ts
index 4cda7dd..06c58db 100644
--- a/server/seed-campaign.ts
+++ b/server/seed-campaign.ts
@@ -19,6 +19,7 @@ import {
 	createCommunity,
 	getDocumentData,
 	loadCommunity,
+	markShapesSeeded,
 } from "./community-store";
 
 // ── Layout constants ────────────────────────────────────────────
@@ -481,15 +482,17 @@ export async function ensureCampaignDemo(): Promise<void> {
 	// Check if already seeded
 	const data = getDocumentData(slug);
 	const shapeCount = data ? Object.keys(data.shapes || {}).length : 0;
+	const alreadySeeded = (data?.meta as any)?.shapesSeeded === true;
 
-	if (shapeCount === 0) {
+	if (shapeCount === 0 && !alreadySeeded) {
 		addShapes(slug, CAMPAIGN_SHAPES);
+		markShapesSeeded(slug);
 		console.log(
 			`[Campaign] Seeded ${CAMPAIGN_SHAPES.length} shapes into campaign-demo`,
 		);
 	} else {
 		console.log(
-			`[Campaign] campaign-demo already has ${shapeCount} shapes`,
+			`[Campaign] campaign-demo already has ${shapeCount} shapes (seeded=${alreadySeeded})`,
 		);
 	}
 }
diff --git a/server/seed-demo.ts b/server/seed-demo.ts
index 3aa528a..e7f55f5 100644
--- a/server/seed-demo.ts
+++ b/server/seed-demo.ts
@@ -13,6 +13,7 @@ import {
 	createCommunity,
 	getDocumentData,
 	loadCommunity,
+	markShapesSeeded,
 } from "./community-store";
 
 // ── Alpine Explorer 2026 — Demo Scenario ──────────────────────────
@@ -781,14 +782,16 @@ export async function ensureDemoCommunity(): Promise<void> {
 		await loadCommunity("demo");
 	}
 
-	// Check if already seeded (has shapes)
+	// Check if already seeded (has shapes or was previously seeded then cleared)
 	const data = getDocumentData("demo");
 	const shapeCount = data ? Object.keys(data.shapes || {}).length : 0;
+	const alreadySeeded = (data?.meta as any)?.shapesSeeded === true;
 
-	if (shapeCount === 0) {
+	if (shapeCount === 0 && !alreadySeeded) {
 		addShapes("demo", DEMO_SHAPES);
+		markShapesSeeded("demo");
 		console.log(`[Demo] Seeded ${DEMO_SHAPES.length} shapes into demo community`);
 	} else {
-		console.log(`[Demo] Demo community already has ${shapeCount} shapes`);
+		console.log(`[Demo] Demo community already has ${shapeCount} shapes (seeded=${alreadySeeded})`);
 	}
 }
diff --git a/server/seed-template.ts b/server/seed-template.ts
index 3ea8f1a..4ebb657 100644
--- a/server/seed-template.ts
+++ b/server/seed-template.ts
@@ -14,6 +14,7 @@ import {
 	getDocumentData,
 	listCommunities,
 	loadCommunity,
+	markShapesSeeded,
 } from "./community-store";
 
 // ── Template Shapes ─────────────────────────────────────────────────
@@ -418,12 +419,14 @@ export function seedTemplateShapes(slug: string): boolean {
 
 	const data = getDocumentData(slug);
 	const shapeCount = data ? Object.keys(data.shapes || {}).length : 0;
+	const alreadySeeded = (data?.meta as any)?.shapesSeeded === true;
 
-	if (shapeCount > 0) {
+	if (shapeCount > 0 || alreadySeeded) {
 		return false;
 	}
 
 	addShapes(slug, TEMPLATE_SHAPES);
+	markShapesSeeded(slug);
 	console.log(`[Template] Seeded ${TEMPLATE_SHAPES.length} template shapes into "${slug}"`);
 	return true;
 }