Nice to see. Love this bifoliate species. Still waiting for mine to bloom. What kind of rest do you give yours? Temps?
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I don't give it much of a rest, but it takes a rest from mid-summer to mid autumn. I do not change my watering or fertilizing. It gets full sun equivalent 12 inches from a 100W LED fixture, daytime temps 80F+ and night time temps of 60F in the summer; winter is 10F cooler. I fertilize with urea-free fertilizer at 125-150ppm weekly.
Ahhhhh....walkeriana...one of my favs. Flat or not, I love everything about walkeriana! Good growing.
[Too bad we don't have smell-a-vision.]
EDIT - My bad...I didn't read the title nobilior and just saw the flowers. So similar to walkeriana!...skinnier "waist" on a longer lip...but very, very similar.