I received my Nepenthes albomarginata, Black in
The plant on the left is N. ventricosa x spectibilis I
They all get lots of indirect
Before they were moved to
I hope I'm doing okay with
Attached is a photo of the
Any advice you could share
(Submitted in July 2020.)
N. albomarginata, Black
Flower bud of N. albomarginata, Black
N. sibuyanensis x talangensis
N. ventricosa x spectabilis
RESPONSE BY JEFF DALLAS:
This dark form of N. albomarginata can be slow to pitcher. It's definitely one of the Nepenthes that lives up to the stereotype of liking it warm and bright. Your conditions sound pretty good, but it may just need more sun. Ideally, it should get several hours of DIRECT sunlight. The color on your plant is dark, but it definitely could be darker to the point where you don't see any green. This is one of the few Nepenthes that can tolerate full sun.
One winter many years ago, I grew this species in my home in a west-facing window as an experiment. It got lots of direct sunlight when the sun was out, and it produced pitchers like crazy. I moved the plant back to the greenhouse the following summer, and it stopped producing pitchers. It grew long vines and flowers, but no pitchers until we changed the greenhouse film that allowed more intense sunlight. Some Nepenthes just won't pitcher unless they are getting enough intensity. N. albomarginata is one of them. They grow long vines in the wild to grow over tree branches and reach more sunlight. You mentioned that your plants get lots of indirect sunlight, so this might be the reason for no pitchers.
(Keep in mind that what you think is bright enough is irrelevant. Nepenthes don't care what you think. Each Nepenthes will always be the final judge of what is bright enough, regardless of what the plant next to it is doing.)
It could be that the windows are also blocking UV light, so this one is being grumpy about it. For many other varieties it doesn't seem to matter as much. An example of this I saw this last year with some Nepenthes. I had in a window at my other job. It was a big picture West facing window with lots of direct sun. N. sanguinea and N. St. Mercury did great. N. Red Queen and N. Falcon didn't so much. They grew, but pitchered little if any. They were getting plenty of sun, but our windows in this building are Argon filled, and block 100% of UV light. I'm not sure how to recommend a way to get more unless you can just open a window to let direct sun hit that plant.
The only other option is to use strong LED shop lights (40 watts, cool white) and bring it close to the plant. Start with 12 inches. The leaves
By the way, the plant is male. It will flower a lot, and we cut them off because they smell bad.
N. albomarginata, Black in my home, producing pitchers in winter!
It was in a west window getting direct afternoon sunlight.
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