I started with 6 inches of soil in the bottom of the container consisting of potting soil, some peat and osmocote 14-14-14. added the spuds and topped with two inches more soil with a light layer of composted manure. Ive read that I can use compost as the soil that I add in the future. I have cotton burr compost and was wondering if I could use that. Here is a pic of the garbage can that I found and am using as the container.
