Yellow Foxtail
Setaria pumila · Warm-season, Annual, C4
Grass Family
Poaceae, subfamily Panicoideae, tribe Paniceae
Grass Category
Invasive/Weed Grass, Pasture/Forage Grass
Variety / Cultivar
Wild type (No specific cultivated varieties for turf)
Hardiness Zones
USDA Hardiness Zones 3 through 9. Excellent heat tolerance, killed by the first hard frost as an annual plant.
About This Grass
An annual grassy weed with upright stems reaching 1 to 3 feet tall when mature. It features distinctive reddish-purple coloration at the base of the stems, flat medium-green leaves, and cylindrical, bristly, foxtail-like seed heads that turn a golden-yellow color at maturity.
Blade Characteristics
Medium to coarse width (4-10 mm), flat, with a pointed tip and a light green to blue-green color. Rolled in the bud (vernation). The ligule is a fringe of hairs, and auricles are absent. The collar is broad and continuous, often with sparse hairs near the base of the blade.
Root System
Fibrous root system with moderate depth. Does not form a dense turf sod. Establishes rapidly from seeds in spring and thrives in disturbed soils.
Growing Information
Origin Region
Native to Europe and Asia, now widely naturalized across North America and temperate regions globally.
Growth Habit
Bunch-type (clump-forming) with semi-erect to sprawling stems, often rooting at the lower nodes.
Sunlight & Water Needs
Requires full sun for optimal growth. Moderate water needs, but highly adaptable and exhibits fair drought tolerance by entering dormancy during severe dry spells. Prefers fertile, disturbed, well-drained soils but tolerates a wide range of soil pH.
Mowing & Maintenance
Responds poorly to frequent low mowing, which weakens it, but it easily survives at higher cutting heights (above 2.5 inches). High maintenance as a weed in turfgrass, requiring selective herbicides, pre-emergents, or hand-pulling.
Special Characteristics
Poor wear tolerance for turf use. High seed production makes it a persistent weed in lawns, gardens, and agricultural fields. Not salt-tolerant. Good erosion control temporarily on disturbed soils due to rapid establishment.
Ecological Information
Introduced species in North America. Seeds provide food for ground-feeding birds and small mammals. Often considered a noxious agricultural weed in crop fields and an undesirable invader in manicured home lawns.