White Clover is the Secret to a Lush, Low Maintenance Lawn A tried-and-true herbicide-free way to control weeds White clover adds nitrogen to the soil Use to top seed an existing lawn or mix with grass seed for new lawns Before the widespread use of herbicides, most lawns contained white clover. As it grows, clover ensures healthy turf by adding nitrogen to the soil and choking out weeds. This white clover is well suited to lawns as it is a low-growing variety and has good drought resistance.