Last year I began mixing 1/2 a container with the previous year's mix, and added compost, ultrasorb, and new mix to make up the new 1/2 and my plants did very well. I'm doing it again this year. I do have to water at least once daily and twice daily when the heat kicks in. I use Happy Frog, Ocean Forest and Coco Loco mix and I don't measure precisely. I mulch with partially composted leaves. I haven't had problems with compost in containers. I think it is a key ingredient for strong plants. This is outside growing only.
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