I'm pretty sure that I read it was, but to be sure, I just wrote to them. I'll post what they say. I've used the Burpee bricks and also their coir pellets, but I prefer the bagged material. But only because I find it easier to work with than the bricks -- pellets are pretty expensive.
-GG
Last edited by Greatgardens; March 20, 2018 at 07:06 AM.
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