Great tropical wonderland there, I wish I can have the means to do one in my room too!
But looking at the many interesting terrariums and greenhouses and sheds that you guys have come up with, I believe they show enough proof that the ultimate enemy of pitchering is low humidity. Of course, I'm aware of myself living in a tropical country that humidity is of not much concern but in the concrete jungle, coupled with a few lacking factors, is what I'm experiencing now
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