rapidly yellowing Sedirea Japonica

[PuiPuiMolcar]

My S.Japonica I bought from Andy a month ago started yellowing leaves rapidly. I cut the dying leave anyway to check if there is rot in the crown, and I do not really see any sign bacteria infection in the stem or crown. Whatever it is, I hope it wont infect the neighboring plant. Ironically yet, one of its root is still growing.
On the third pict, is it pupping another growth?

[Roberta]

The growth with the yellow growth looks dead, the crown looks dried up, but since it has a good root, it still may pop out a new growth. No more cutting... But the green growth (on the left side of the photo) looks fine. And the green growth may, indeed, be producing a new basal growth. These do produce basal growths, forming a clump rather than a tall plant. So the old growths may die back, but this growth pattern is normal as long as there are also new growths.

[PuiPuiMolcar]

thank you, I noticed that there is also another growth that has been removed (by andy). So I do hope this is just a pattern of this orchid.

[Jmoney]

are you growing this in a greenhouse or other high humidity environment?

[Roberta]

In southern California, this species really doesn't need a greenhouse. Mounted, it does need daily watering. (I grow it outside, I strongly suspect that Andy grew it in a shade house rather than greenhouse, but his nursery is humid, he waters A LOT.)

[Jmoney]

I was just thinking that if it was used to high humidity and went to a dry place that could potentially cause some leaf drop

[Roberta]

I think that yellow leaf was just an old dying growth.. the crown doesn't look great either. I would not have cut the leaf, much better to just let nature take is course. But the new growth looks fine.

[Jmoney]

yes I think you are right! new growth looks happy enough