So, to be safe, it's best to pull the mock strawberry beneath the azaleas. Keep in mind, too, that a healthy, vigorous lawn is your first defense against weeds. Weed seeds germinate more easily in a thinning lawn. Mow at the proper height. Avoid thatch buildup.
Annual bluegrass is a cool-season annual that produces lots of seeds.
The tufts of grass are upright and most visible in dormant St. Augustine lawns. This annual begins to take hold in the fall when temperatures drop and there is abundant moisture. If you don't remove it before it seeds, you'll have more. Bluegrass is not that unsightly in a lawn, when mown, but it will turn a yellowish-white after seeding. You can tolerate it, as it will disappear with warmer weather, or dig it, if you have a lot of time on your hands, making sure to get the roots.