Today I bought the materials to make 3 4'x4' raised boxes for my backyard. The info at Square Foot Gardening says the mix should be 1/3 compost, 1/3 peat moss and 1/3 vermiculite. But, when I was up at Gesthemene today, they didn't have any vermiculite, saying it was "banned" (I'm assuming they were thinking of the asbestos contamination thing from a few years ago) and only had small bags of perlite, which I assume would cost a bundle for 9-10 cu/ft I'd need.
So my questions are:
- is vermiculite still available and if not, where can I get large bags of perlite ?
- short of getting either of those, anyone have any suggestions for another mix ?