Allium campanulatum, commonly known as dusky onion or Sierra onion, is a perennial herb native to the western United States, specifically from southeastern Washington to southern California and western Nevada. It is typically found in a variety of habitats including open woodlands, grasslands, and dry, rocky slopes in foothills and mountains. This species is adapted to well-drained soils and is often seen in areas with a Mediterranean climate characterized by wet winters and dry summers.

The dusky onion grows from a gray-brown bulb and produces a stout stem up to 40 centimeters tall, with usually two long, thin leaves that wither by the time of flowering. The inflorescence is an umbel containing 10 to 50 flowers, which can be pink, purple, or white with a dark-colored base, and are quite showy when they bloom from May to August. The flowers are attractive to a variety of pollinators, including bees and butterflies. In cultivation, dusky onion is valued for its drought tolerance and its ability to add color to rock gardens, native plant gardens, and wildflower meadows. It requires little maintenance once established and thrives in full sun to part shade with low water needs, making it suitable for xeriscaping. It is not commonly associated with serious diseases or pests, but overwatering can cause bulb rot.CC BY-SA 4.0