Tolumnia leaves turning Dark green

[kybasche]

Hello all

I've got a Tolumnia from C&H (Robsan 'Orchid World' AM/AOS x Newberry Dancer 'Behemoth'). Seems to be alive by my eye, but the leaves have gone from a nice, vibrant green to a... well.. to a dark green (see pics).

There is some new growth (the 3 smallest leaves that are closest in the picture), but they too are coming in dark (though began their respective lives much lighter).

I read elsewhere that this can be caused by having light conditions that are too LOW. Is this a potential culprit? Is there some other, more prevalent factor that I might be missing that causes this kind of symptom? Will the leaves ever regain a lighter colour?

I thank you, as always, in advance, for your kind suggestions

[Ross]

Nope. This looks fine to me. It's getting quite high light (just what it likes and needs to bloom). I'd leave it alone and keep it watered, but dry it out by nightfall.

[JonnyBravo]

low light is a possibility- in the wild they grow in allllllmost full sun. mine are under light shadecloth, but receive strong sunlight all day long through the cloth. they have not darkened any.

another possibility is cold: almost all of my orchids take on a darker almost purple- or red-tinged dark green color when it gets cold. is your plant outdoors? did you have it outside this winter? does it get cold at night? some of my more sensitive species start turning that color once it gets below the low 70s.

[JonnyBravo]

forgot to mention: the color is not really a problem. all of my plants that turned darker have lightened up (a bit) with the return of warmth and sun, and have all bloomed and gotten new growth.

[kybasche]

Definitely will get below 70 at night. It's been inside all winter, but we leave the windows open at night and the temperature near them drops a bit at times.

The plant is still growing (more new leaves are pushing through now), so I'm not terribly worried. Will keep you all updated if anything drastic changes.

Thanks!