Plant Ammi in full sun. It is a long-day plant, and will be triggered to flower as hours of sunlight increase in the spring. The best soil type for Ammi is loose, well-draining, and of average fertility. Too much nitrogen and other nutrients will trigger the plant to produce lots of foliage, but very few flowers. After Ammi has established its root system, it is quite drought tolerant, as well as disease and insect resistant. You can expect Ammi to flower about 80 to 90 days after the plugs were transplanted, but time to bloom is always dependent on temperature and weather. Sunshine and warmth will speed up growth!