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 named agricultural cultivars for turf use)
Hardiness Zones
USDA Hardiness Zones 3 to 10; highly adaptable to various climatic zones as a summer annual.
About This Grass
An annual grassy weed growing 1 to 3 feet tall with flat, smooth blades. It is easily recognized by its distinctive cylindrical, dense, spike-like panicle inflorescence resembling a foxtail, which features yellowish-green to golden bristles surrounding the spikelets.
Blade Characteristics
Medium width (3-8 mm), flat shape, pointed tip, light green to blue-green color. Rolled in the bud (vernation). The collar region has a fringe of hairs representing the ligule, and auricles are absent. Distinctive long, scattered hairs are often found near the base of the upper surface of the leaf blade.
Root System
Fibrous, moderately deep root system. Establishes rapidly from seed in disturbed soils, lacks rhizomes or stolons, and reproduces exclusively by seed.
Growing Information
Origin Region
Native to Europe and Asia; now widely naturalized throughout North America and temperate regions globally.
Growth Habit
Bunch-type (clump-forming), growing upright to semi-erect with tillers branching from the base.
Sunlight & Water Needs
Requires full sun and thrives in open, disturbed areas. Moderate to low water needs once established, with good drought tolerance during summer months. Prefers well-drained loamy or sandy soils.
Mowing & Maintenance
High maintenance if controlled as a weed; survives frequent low mowing by spreading prostrate stems and setting seeds below cutting height. Manual pulling or pre-emergent herbicides are required for control.
Special Characteristics
Poor wear tolerance for turf use; highly prolific seed producer capable of invading thin lawns, agricultural fields, and waste areas. Resistant to standard broadleaf weed controls as it is a grass.
Ecological Information
Introduced species in North America. Seeds provide a food source for ground-feeding birds and small rodents, but the plant is widely considered an agricultural weed and lawn invader in turfgrass settings.