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HelloMaren , i don't know this technique .I've looking for this product and epsomite is (MgSO4·7H2O), commonly called Epsom salt...that right.It's only Magnesium sulfate in fact.For me ...only crushed horn and my compost ..i place the plants in a shady place too keep the foliage very green and my plantss are not burn in this periode.I think, plants could make much photosynthètis and could be much stronger in the next season..you know ?Thank's angie for your comments..What species of Cyp have you in your garden ?Chuck, the Cyp are able too live in Californie..I know Cypripedium californicum in your region but not others .. Your cyp are in your garden or in pots ?What species of Cyp have you ? cypripedium montanum and Cypripedium californicum that's all ?
I have written to the distributors of puzzolane but they quoted €800+ for a cubic metre (big bag) and that is just too expensive for me. Pity, the material looks very promising and I see you have it on your plants.