diff --git a/.env.example b/.env.example
index 67d1d71..2cbdbaa 100644
--- a/.env.example
+++ b/.env.example
@@ -40,5 +40,6 @@ MINIO_ROOT_USER=famapp
 MINIO_ROOT_PASSWORD=changeme
 MINIO_BUCKET=garden
 
-# Perenual plant species API (https://perenual.com — free tier available)
-PERENUAL_API_KEY=
+# OpenPlantBook plant species API (https://open.plantbook.io — free account required)
+OPENPLANTBOOK_CLIENT_ID=
+OPENPLANTBOOK_CLIENT_SECRET=
diff --git a/src/modules/garden/server/species-lookup.ts b/src/modules/garden/server/species-lookup.ts
index abdaa5a..289583f 100644
--- a/src/modules/garden/server/species-lookup.ts
+++ b/src/modules/garden/server/species-lookup.ts
@@ -13,60 +13,89 @@ export type SpeciesSuggestion = {
 };
 
 const CACHE_TTL_MS = 24 * 60 * 60 * 1000;
-const BASE_URL = "https://perenual.com";
+const BASE_URL = "https://open.plantbook.io/api/v1";
+
+type TokenCache = { access_token: string; expiresAt: number } | null;
+let tokenCache: TokenCache = null;
+
+async function getToken(): Promise<string | null> {
+  const clientId = process.env.OPENPLANTBOOK_CLIENT_ID;
+  const clientSecret = process.env.OPENPLANTBOOK_CLIENT_SECRET;
+  if (!clientId || !clientSecret) return null;
+
+  if (tokenCache && Date.now() < tokenCache.expiresAt - 60_000) {
+    return tokenCache.access_token;
+  }
+
+  try {
+    const res = await fetch(`${BASE_URL}/token/`, {
+      method: "POST",
+      headers: { "Content-Type": "application/x-www-form-urlencoded" },
+      body: new URLSearchParams({
+        grant_type: "client_credentials",
+        client_id: clientId,
+        client_secret: clientSecret,
+      }),
+      cache: "no-store",
+    });
+    if (!res.ok) throw new Error(`token request failed: ${res.status}`);
+    const json = (await res.json()) as { access_token: string; expires_in: number };
+    tokenCache = {
+      access_token: json.access_token,
+      expiresAt: Date.now() + json.expires_in * 1000,
+    };
+    return tokenCache.access_token;
+  } catch (err) {
+    console.error("[species-lookup] getToken failed", err);
+    return null;
+  }
+}
+
+function parseSunlight(value: unknown): string[] {
+  if (Array.isArray(value)) return value.map(String);
+  if (typeof value === "string" && value) return value.split(", ");
+  return [];
+}
 
 function parseItem(item: Record<string, unknown>): SpeciesSuggestion {
-  const rawNames = item.scientific_name;
-  const scientificName = Array.isArray(rawNames) && rawNames.length > 0 ? String(rawNames[0]) : "";
-
-  const sunlight = Array.isArray(item.sunlight) ? item.sunlight.map(String) : [];
-
-  const defaultImage = item.default_image as Record<string, unknown> | null | undefined;
-  const rawImageUrl = defaultImage?.regular_url ?? defaultImage?.medium_url ?? null;
-
   return {
-    id: String(item.id),
-    common_name: String(item.common_name ?? ""),
-    scientific_name: scientificName,
+    id: String(item.pid ?? ""),
+    common_name: String(item.alias ?? ""),
+    scientific_name: String(item.display_pid ?? ""),
     watering: String(item.watering ?? ""),
-    sunlight,
-    cycle: String(item.cycle ?? ""),
-    default_image_url: rawImageUrl ? String(rawImageUrl) : null,
+    sunlight: parseSunlight(item.sunlight),
+    cycle: "",
+    default_image_url: item.image_url ? String(item.image_url) : null,
   };
 }
 
 export async function searchSpecies(query: string): Promise<SpeciesSuggestion[]> {
-  const apiKey = process.env.PERENUAL_API_KEY;
-  if (!apiKey) return [];
   if (!query.trim()) return [];
+  const token = await getToken();
+  if (!token) return [];
 
   try {
-    const url = `${BASE_URL}/api/species-list?key=${encodeURIComponent(apiKey)}&q=${encodeURIComponent(query)}`;
-    const res = await fetch(url, { cache: "no-store" });
-    if (!res.ok) throw new Error(`Perenual API error: ${res.status}`);
+    const url = `${BASE_URL}/plant/search/?alias=${encodeURIComponent(query)}&limit=20`;
+    const res = await fetch(url, {
+      headers: { Authorization: `Bearer ${token}` },
+      cache: "no-store",
+    });
+    if (!res.ok) throw new Error(`OpenPlantBook search error: ${res.status}`);
 
-    const json = (await res.json()) as { data?: unknown[] };
-    if (!Array.isArray(json.data)) return [];
+    const json = (await res.json()) as { results?: unknown[] };
+    if (!Array.isArray(json.results)) return [];
 
-    const results = json.data.map((item) => parseItem(item as Record<string, unknown>));
+    const pids = json.results
+      .map((r) => String((r as Record<string, unknown>).pid ?? ""))
+      .filter(Boolean);
 
-    await Promise.allSettled(
-      results.map((r) =>
-        db
-          .insert(gardenSpeciesCache)
-          .values({
-            speciesId: r.id,
-            data: r as unknown as Record<string, unknown>,
-            cachedAt: new Date(),
-          })
-          .onConflictDoUpdate({
-            target: gardenSpeciesCache.speciesId,
-            set: { data: r as unknown as Record<string, unknown>, cachedAt: new Date() },
-          }),
-      ),
-    );
-
-    return results;
+    const details = await Promise.allSettled(pids.map((pid) => getSpeciesById(pid)));
+    return details
+      .filter(
+        (r): r is PromiseFulfilledResult<SpeciesSuggestion> =>
+          r.status === "fulfilled" && r.value !== null,
+      )
+      .map((r) => r.value);
   } catch (err) {
     console.error("[species-lookup] searchSpecies failed", err);
     return [];
@@ -83,12 +112,15 @@ export async function getSpeciesById(id: string): Promise<SpeciesSuggestion | nu
 
   if (cached) return cached.data as unknown as SpeciesSuggestion;
 
-  const apiKey = process.env.PERENUAL_API_KEY;
-  if (!apiKey) return null;
+  const token = await getToken();
+  if (!token) return null;
 
   try {
-    const url = `${BASE_URL}/api/species/details/${encodeURIComponent(id)}?key=${encodeURIComponent(apiKey)}`;
-    const res = await fetch(url, { cache: "no-store" });
+    const url = `${BASE_URL}/plant/detail/${encodeURIComponent(id)}/?include=care`;
+    const res = await fetch(url, {
+      headers: { Authorization: `Bearer ${token}` },
+      cache: "no-store",
+    });
     if (!res.ok) return null;
 
     const item = (await res.json()) as Record<string, unknown>;