Organic is certainly possible in standard containers and most who are successful add 1/3 to 1/2 manures and/or composts. Easier with some crops than others. Tomatoes as an example are pretty strong growers and heavy feeders. Growing organically in Self-Watering-Containers is a good bit more challenging. I have switched most of my containers and all of my Earthbox SWCs to synthetics.
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