Hey guys, I mostly just do mowing so I need to ask an overseeding question. I'm going to overseed my lawn this fall with a slit seeder. My question is how short should I cut my existing grass(fescue) before I over seed? I've done the slit seeding once before but it was a total kill that I did at a friends house. That one turned out really nice. I don't need to kill off my existing lawn though. Just wanting to fill in some bare spots and make it a little thicker. Thanks in advance.