It takes two cups of 6-8-10 fertilizer per box and one cup of dolemite. I use 8-10-8 as it is more readily available. For potting soil, use Jungle Growth or Speedlings. You may have to search for Jungle Growth but I think it is the best for Earthboxes. I currently have 15 Earthboxes and 7 faux Earthboxes. The faux Earthboxes I created are the same size and shape. Took me a while to weld them up. However, they are sturdy. I am going to buy 4 more of the real deal next week.
I think it is better to save the time and effort and just spring for the real thing.
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