Bottom heat/seedling heat mat for potted Phals ?
My grow room is dropping down to around 64 degrees over night, and some of the Phals don't like it. My young Bellina alba dropped a couple of leaves that it couldn't afford to lose, and temperature is the only variable I can come up with.
I read through an older thread about seedling heat mats for plants in S/H.
Is is safe to use a heat mat for orchids potted in sphag or bark, or might that overheat the roots?
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