I've never had mold or green slime in my Earthboxes, and sometimes I use them year round without emptying them. I've had some container mix in the reservoir, but never the anaerobic odor I've had with my old Gardener's Supply Sub-irrigation planters. I believe those originally came with some sort of soil block, but I've had them for more than 20 years now, and haven't figured out a replacement.
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