If your lawn has never been treated and has 90% or more weeds than grass, a lawn renovation by Berkshire Turfgrass Specialists is recommended. This is when we use a non-selective herbicide to kill all the weeds and grass in the lawn. We then go through and aerate it and then put down new grass seed. This is done during the fall time. Use of one or more sprinklers is highly recommended for the success of a lawn renovation.