Autumn Onion has slender, upright, blue-green leaves and rounded clusters of small pink to pale lavender flowers. It typically blooms in late summer to early fall, making it useful for extending the flowering season. It is an excellent choice for dry prairie gardens, sunny borders, and gravelly sites. It forms small clumps and is very drought tolerant once established. It requires excellent drainage, particularly during winter; wet, heavy soil can cause bulbs to rot. It does not need rich soil. You can divide bulbs in fall or early spring if clumps become crowded.