Buddleja marrubiifolia, commonly known as Woolly Butterflybush, is an evergreen shrub native to the semi-arid regions, particularly on limestone hills and gravelly soils near water sources such as ponds in Texas and Northeastern Mexico. It is a dioecious shrub, meaning it has male and female flowers on separate plants, with a multi-branched habit reaching 0.5 to 2 m (1.6 to 6.6 ft) in height. The bark is greyish to blackish and deeply fissured. Woolly Butterflybush produces clusters of vibrant orange flowers from spring to summer, which are particularly attractive to butterflies and other pollinators.

The plant is valued for its drought tolerance and ability to thrive in poor, well-drained soils, making it an excellent choice for xeriscaping and low-water-use gardens. It is often used in Tucson, Arizona, to attract butterflies and is also appreciated as an ornamental plant in Hawaii. Woolly Butterflybush requires full sun to bloom profusely and prefers very low to low water once established, reflecting its adaptation to arid environments. It is hardy to USDA zone 7 and can be susceptible to root rot if overwatered or planted in poorly drained soils.CC BY-SA 4.0