Nimblewill is a warm season grass that stays green in hot weather and turns brown when the weather gets cold. If it bothers you the only thing you can do about it is either dig it up and add soil then reseed, or spray it with a chemical in the summer, then reseed in the fall. If a lawn has a lot of different grasses and you’re looking for uniformity, your best choice might be to renovate the lawn. The nice thing about nimblewill is that it stays green during hot summer weather. Please contact us with any questions.