Yellow foxtail is a summer weed that gets its name from the seed head that resembles a fox's tail. Its leaves are rolled in the bud, and the leaf blades have fine, silky hairs on the upper surface toward the leaf base. The stems are erect with a reddish tint at the base, and the seed head is cylindrical in shape and turns yellow when it reaches maturity.
Yellow foxtail weeds grow in moist, fertile soil during mid- to late summer. If you want to kill these weeds, it's important to maintain a healthy turf density and to avoid mowing close to the summer. You should also skip summer fertilization to prevent this weed from taking over your property. Applying a pre-emergent herbicide containing dithiopyr a few weeks before germination in the spring can help to prevent a weed infestation. Applying postemergent herbicides can help to bring immature weeds under control.