|Weeds Growing through Rock Mulch|
If one has to pull weeds from a rocky surface, it is very useful to have something to save one's knees. Here's what I chose: I Love My Garden Kneeler. The article will show me using it.
Maybe you would prefer one of these cheaper options. I have tried some of the pads available at Walmart and they just did not offer much knee protection on hard or rocky surfaces. They only lasted a season. If you opt for only a pad, be sure you get a thick one that will protect your knees.