advice on Cymbidium ensifolium “Green Top x self”

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I purchased this Cymbidium ensifolium “Green Top” from Sam Tsui a few years ago, a treasured memory of one of my few visits to his incredible facility. He had flasked it from a selfing of his father’s favorite plant. It was a small seedling then. It has grown considerably but never bloomed. It summers outdoors and winters in a bright east window. It always had a few of these black markings on its leaves but seems to grow ok. This year, the spots seem greatly increased and I seek either reassurance that they’re no big deal or else suggestions for how to treat if it’s a problem. None of my other Cymbidiums have this issue but I’ve always kept this one apart from others, more due to concern for its beautiful real Chinese Cymbidium pot than for fear of disease. I think I remember Sam saying it didn’t bloom well for him either but I’m not sure of that’s a conflated mismemory. Thank you.
 

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The slang for this is "ensifolium crud", not a pretty term at all. Generally found in this species or hybrids with a high percentage of it that are stressed, especially temperature stressed. Not all varieties seem to be affected. I gave up on this species long ago because my conditions we just too cool for many of the cultivars that really wanted it warm.
 
Thank you! And drat; I’ve been growing it cold! Agh! Moving to the warm room. Love the “technical” slang name “ensifolium crud” ha ha ha. But is it fungal? Would Physan help? Or do I just need to warm it up and bide my time?

These Jensoa Cymbidiums are my favorite and my downfall. I successfully grow C. quiebiense — in bloom right now for the third time in a year — and sinense (dozens of flowers this fall), and cyprifolium (robust grower but doesn’t bloom for me…yet). C. kanran and goeringii continue to die on me and I swear I’ll never try again but…then I do. I thought ensifolium would be easy but of course, here I am, struggling. These Jensoas seem ubiquitous and easily grown throughout temperate Asia but I find them wildly variable in needs to the point of being driven mad.

My blooming quiebiense is its own frustration: the flowers don’t fully open. I used to think that was somehow my fault but after repeated bloomings, I think it’s genetic. Here’s a photo. Looks more like Pterostylis!
 

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