Hello. I am planning on putting down lava rock/landscape stones around my house. I will have perennials planted in the same area. In some areas, the slope is fairly steep (drops 3 feet per 6 feet). I have large boulders in that area for design and to help prevent erosion. How do I prevent the landscape stones from sinking into the ground. I have read all the horror stories regarding landscape fabric but I can't figure out what else to use to help hold the stone in place.

All help is appreciated!