I have a half-acre garden that's been growing like mad this summer. The drive and parking space are gravel. That's the only bit of the garden that's allowed weedkiller. Sodium chlorate, which you can't get now anyway, had a nasty habit of spreading sideways so it was hard to judge how close to the grass I could go. These days the gravel gets a couple of doses of glyphosate per annum from those little bottles of spray from Poundland. It doesn't spread and is rapidly inactivated. Apart from that everything is organic. I suppose I'm disqualified from bragging that my garden's organic, but sometimes I think it's OK to indulge in a very limited transaction with the world of technology!