I have several "terrarium only" begonias (b. chlorosticta, amphioxus and several others) growing in long fiber sphagnum. I've done this for years with great success. Last year I switched from locally available moss to New Zealand long fiber. Plants did great for a while. Now, suddenly, foliage is bleaching out. Some is turning pink. I thought this might be a light problem (artificial light --some under T 8 bulbs, some plants under led lights) but the light source has not changed. Plants have not been moved. Any ideas?
begonia leaf problem
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