The flowers appear in whorls in the upper leaves. You can easily pull henbit. Some use a pre-emergent herbicide for broadleaf weeds in early fall to discourage unwanted plants. There is a grassy weed in my lawn and flower beds with light-colored seed heads. What is it, and how can I get rid of it.
Annual bluegrass is a cool-season annual that produces lots of seeds.
The tufts of grass are upright and most visible now in still-dormant St. Augustine lawns. This annual begins to take hold in the fall when temperatures cool and there is abundant moisture. If you don't remove it before it seeds, you'll have an ongoing supply. Bluegrass is not that unsightly in a lawn, when mown, but it will turn a yellowish-white after seeding and becomes most noticeable. You can dig it, making sure to get the roots.