Bog orchids
I too have been trying my hand at growing bog orchids. I use 20 gallon plastic containers that I buy at Lowes in the pond section. By drilling holes around the container halfway up, you create a bog envirenment, with a permanent water reservoir in the bottom. This bottom part is filled with cypress mulch (or something else which will not easily decompose), and my mix goes in the top half for my tubers. The mix varies, depending on which plants you are growing, but I use a combination of course sand, sphagnum moss, compost, and ground up pine bark for my Calopogon, Platanthera, Galearis, Dactylorhiza, Bletilla, Calanthe, and Pogonia. I will be expanding to larger beds as I delve into the terrestrials a little more.
Glen
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