Nutgrass can be found in all lawns. It will die off in the winter; however, new growth in the spring comes from underground nuts that can be buried as deep as four feet. Very little of the seed is viable; however, growth from established nuts are very evasive and difficult to eradicate.
To control nutgrass, multiple applications of Image (a selective herbicide) is recommended and is considered safe for use on most varieties of turfgrass... ALWAYS READ & FOLLOW LABELED DIRECTIONS!