I solarize my Earthboxes and 7 gallon pots for 6-8 weeks in the summer, then dig out the old fertilizer strip in the Earthbox, add new lime and new fertilizer, top off with new mix. It's reused every year, unless I get something unusual happening during the previous growth cycle, such as a peculiar taste, or the one box actually got nematodes from the yard man kicking up native soil into the openings, with his weed whacker.(a very freaky thing that only happened to one Earthbox, and once in all these years)
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