I would research all the other threads that talk about DIYing potting MIX. I use the Larry Hall formula but everything I do is subirrigated. Lots of potting mix recipes on this site and imo, NO NEED to buy wonder soil: http://tomatoville.com/showthread.php?t=37141
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Subirrigated Container gardening (RGGS) in NY, Zone 7!
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