Joined: Fri May 01, 2020 9:01 pm
I recently developed an interest in carnivorous plants and spent time reading up on them. Decided to buy a couple sundews online, one of which was a Drosera graomogolensis.
It seems to be healthy since it is producing dew and growing new leaves. However, I'm a bit concerned about it; while it is now growing new leaves, the back of the leaves turn a rusty brown, which gradually becomes black. The leaves still unfurl and the tentacles appear healthy so far, but pretty much the entire back of the leaf becomes black. An interesting note is the perlite on the surface of the media seems to be having the same color change, rusty brown to dark brown/black. (Here are some photos)
My personal thought is it couldn't be sunburn, since admittedly, it probably doesn't get the optimal amount of direct sunlight. It is on a north-facing garden window and only gets direct sun in the evening for a few hours at most. The rest of the day is bright indirect light.
I have rinsed the media and am watering it using the tray method with reverse osmosis water. Daytime temperature is roughly 80 F, nighttime around 70 F. Not sure what the humidity in my home is.. subjectively I would describe it as not humid.
Any thoughts on what could be causing this?