Replacing pool with garden
We just took down our 18 ft round pool (above ground). We would like to put in a raised garden in it's location. We want to use some old pressure treated 4x4s to build them. We have a lot of vermiculite on the ground from underneath the pool. Can we mix the old vermiculite with soil and other amendments for the raised gardens? We were thinking about 6 pie-shaped raised gardens with a couple of chaise lounges in the middle with maybe an arbor over a swing. Suggestions?