Crocus flowers are easy to cultivate. They are naturally hardy, and naturally resistant to insects and disease. The problem is that each corm will only produce 1 flower, and each flower will only produce 3 saffron stigmas. At the end of your harvest, you’ll only wind up with a tiny bit of usable saffron  Although crocus flowers should appear 6-8 weeks after planting your bulbs, sometimes the flowers will not appear until the following fall, a full year after you plant your bulbs. In some cases, planting in spring can produce blooms in the fall. In the center of each purple crocus flower, you should find 3 orange-red stigmas. Wait for a sunny day when the flowers are fully open, and carefully remove these stigmas from each of your crocus blooms using your fingers. Once you have carefully removed all of the saffron stigmas, lay them out on paper towels in a warm, dry place. Leave them alone for 1-3 days until they are completely dry.  Dried saffron should be kept in a cool, dry place. You can store saffron in an airtight container for up to 5 years. When you are ready to use your saffron, steep the dried stigmas in hot liquid (such as milk, water, or broth) for 15-20 minutes. Add both the liquid and the stigmas to your recipe. Saffron can be used for rice, soups, sauces, potatoes, baked goods, and other dishes. Adding the stigmas along with the liquid allows them to release more color and flavor into your food.

TL;DR in Indonesian:
Bersabarlah. Petik putik dari setiap bunga crocus. Keringkan dan simpan safron. Gunakan safron dalam resep.