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Masterpiece
I've used 1:1 pine bark and perlite on most Elm I collected. I found that even with just pure pine bark, my American Elm and Cedar Elm roots were awesome. Were I to go collecting again, that's all I'd use the first season at least. So if you find that you're out of perlite and cash, just try pine bark.Good question, all of these trees are in unsifted soil. I ran out of my mix with Akadama pretty quick so now it's pure unsifted pumice which holds quite a bit of water but still drains very quickly.
Aaron