Moss is an ancient plant that has been around for at least 400 million years. This holdover from primitive times is very different from other plants because it has no vascular system; instead, it reproduces by spores.
As interesting and unique as it may be, moss means trouble when it pops up in your lawn, which it’s likely to do when grass is thin and weak. The first step to moss control is getting your lawn ready to do battle. Once your lawn is stronger, herbicides will help you eliminate the problem and prevent future outcrops.