Coelogyne cristata

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I used to live in Hobart which had quite cold winters and they survived that with no problems, I guess the winter temp was close to Vietnams highlands where, I believe, they come from. I was also told not to divide as they do not like it, but put another pot filled with growing media and the plant will “ crawl “ into the fresh media.
The information about calcium (and light) is very helpful, and solves a puzzle for me. I have a Coelogyne cristata var. grandiflora whose leaves were beautifully glossy until I went from using tap water over the winter, to switching to rainwater this spring and summer. It never gets high light, and blooms every February, but only puts out 2 or 3 flowers. Now I know what needs to be done.

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