These products are applied as a spray, and a good time to apply would be in early May and again as the label recommends if crabgrass comes back. A good alternative is to apply a lawn weed herbicide that is also labeled for controlling crabgrass. If moisture gets into the product, not only will it clump and be difficult to spread, the nitrogen in the fertilizer can volatilize and be lost. That's the small bag, the larger one treats 15,000 square feet. You would need to keep the product tightly sealed up and use it more than five years. Is there some way to do this other than putting down crabgrass preventer? They only sell it in bags to treat 5,000 square feet.Ī: You are right to be concerned about purchasing a granular crabgrass preventer (that should be put down by April 15) these products often have fertilizer included. Q: I have a very small lawn, less than 1,000 square feet, and would like to control crabgrass. Most folks don't think about them in the fall though. To prevent them, in the fall, use a pre-emergent herbicide like Preen in flowerbeds or a crabgrass preventer in the lawn. Both pull up easily if they are in flowerbeds, but they could be spot sprayed there. Spraying them with a lawn weed killer will hasten their decline, but it's questionable if it's worth the effort in a lawn. They benefit pollinators so where you can tolerate them, let them grow.
They are easily distinguished by the flower position - henbit is held above the foliage and deadnettle's flowers poke out from under the leaves. They don't like warm weather, so with just regular mowing they'll quickly fizzle. Both are winter annuals they germinate in the fall and into late winter, then come on strong in March. Q: What are these annoying little weeds with purple flowers? How can I get rid of them, or better yet, keep them from occurring next year? Are they good for anything?Ī: The two early season small "weeds" with purple flowers are henbit and purple deadnettle.
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