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Yellow foxtail is a summer annual grass that reproduces by seeds. Seeds germinate at temperatures between 68° and 95°F. Yellow foxtail forms a coarse, upright or prostrate, bunch-type grass. It usually branches at the base and may root at lower nodes. Growing up to 4 feet tall, yellow foxtail emerges from a shallow, fibrous root system and normally has flattened stems that are reddish near the base. Leaf blades are 4 to 15 inches long, and most have a spiral twist. The flowers are cylindrical, dense, bristly and erect. They are 2 to 5 inches long, yellow, spike-like and appear from June to September. Yellow foxtail occurs in moist, fertile soils during the mid to late growing season and is often found in new seedings, open turf or bare spots.