Agastache rupestris, commonly known as Threadleaf Giant Hyssop, is a deciduous perennial subshrub or herb native to rocky slopes and canyons in the Southwestern United States, particularly in Arizona and New Mexico. It typically grows to a height of 2-4 feet (0.6-1.2 meters) with a similar spread. This plant is characterized by its fine-textured, thread-like leaves that are gray-green in color and its striking tubular orange flowers with purple calyces that bloom from mid-summer to fall. The flowers are highly aromatic when crushed and are quite showy, making them a highlight in the garden during their blooming season.

Threadleaf Giant Hyssop is valued for its drought tolerance and is a favorite for xeriscaping. It is also used in rock gardens, as a border plant, and in containers. Its flowers are known to attract hummingbirds and other pollinators, adding to its ecological value. Agastache rupestris requires minimal maintenance once established and thrives in full sun to part shade. It prefers well-drained soils and can tolerate nutrient-poor conditions. While generally disease-free, it can be susceptible to root rot if overwatered or planted in poorly drained soils.CC BY-SA 4.0