yellowing leaves-Masdevallia Floribunda
Hi,
I have recently noticed yellowing leaves on my Masdevallia Floribunda that lives in my Exo-Terra tank (pic attached). I have had it several months and it has seemed be healthy all the while....no discolored leaves....growing nicely with roots crawling over the sphag medium surface. About a week ago, I noticed a slight yellowing of one leaf. That same leaf color very soon progressed to a dark yellow-brown and shortly thereafter another leaf began to turn a slight bit yellow. The only change to it's growing conditions is fertilizer. About a month or so ago, I changed from MSU orchid fertilizer for pure water mixed with distilled water to MSU fertilizer for well water (19-4-3), mixed with tap (approx. 7-7.5 ph, I believe). My Masdevallia's other growing conditions are and have been: temp about 76-80 degrees, an approx. 80-95% humidity and roughly 10-12 hrs. of 850-1000 fc of artificial light. I have misted it daily and watered it every 5-6 days. I wondered if the fertilizer change is the problem, why would the leaf yellowing not appear for an approx. 3 wks.
I would appreciate your opinion and your advice.
Vicki
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