Even though I didn't get much rain last weekend, it is still damp enough here to grow weeds and grass like mad. I just mowed late last week and I could mow again. The .15 inch is enough for grass at these temps. I am working near my front steps where I had pea gravel. It has migrated down hill. I am putting some flat rocks around the edge to hold it and trying to fix it so I can mow the edge without hitting the rocks and using roundup for the weeds that try to grow in the pea gravel.