Carolyn, I've seen a debate in forums for several years over container growing and organic methods. Because soil works differently in containers, there is a growing contingent who believe you should not use organic materials, including ferts. The goal is very different, according to them, because of the perched water table and because you don't want to break down the soil mix - which organic things do. You turn it into a veritable pudding if you do.
I have to admit, coming from organic in-ground gardening for many years, I had a hard time with these concepts. I have tried them for the last few years and found them to be superior - at least in my set up. I use several types of containers, including some SWC.
There is a robust thread at GardenWeb - with detractors and supporters - that helps provide some background and explains the science behind the concepts.
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