you can use a little cow manure compost in 5 gallon buckets. My mix is something like 4/5 potting mix 1/5 compost. I add some dolomite lime and that's about it. I've never had issues with root rot or anything other than the fungus I fight with plants all over the garden. if anything my buckets dry out a little fast. that's likely just true due to the heat here and the buckets being fairly small. They seem to drain just fine though. I'm only using 1 bucket this year but I grew in 2 last year, all three pretty successfully. I think I'm going to grow tomatillos in them for the fall since they seem so hardy (they took over my raised beds last year and I had to keep cutting them back).
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