I'm searching for a rock or material that can effectively stop any plant life from growing. Ideally, it would be something commonly available and just short of laying down a solid layer of concrete. Any ideas?
2 Answers
Using gravel or decomposed granite can work, but its effectiveness really depends on how deep you layer it. That’s been my experience here in the desert Southwest. A deeper layer generally helps more than the specific type of rock.
Honestly, nothing works 100% to kill all plants. Even with concrete, you might still see weeds popping up in the cracks. If you're serious about killing everything, I heard rock salt is an option. Just be aware it might wash away when it rains.
But wouldn’t rain just wash the salt away pretty quickly?