If your lawn is really poor, you may want to overseed the entire lawn. The procedure is the same. You will not be able to reseed if you used a weed preventer in February. Weed preventers act by killing the roots of seeds as they germinate. If you need to repair a poor lawn in the spring by reseeding or overseeding, do not use a weed preventer in late winter.
Plant lawns from seed or sod.
Tall fescue blends get by on less water than the traditional bluegrass, ryegrass, fine fescue blends. They are less disease prone, can be mowed lower, require less fertilizer to look their best, and will tolerate more shade. If you plant trees in the lawn, keep the grass at least 30 inches from the trunk. Grass roots produce chemicals that retard the growth of young trees. Lawns really begin to grow this month.