Hey, Naoki. I goofed with this species. The mother plant died. The tuberoid rotted out shortly after I placed it in a plastic ZipLock bag.
Note to self, lesson learned…don't use ZipLock type bags to store dormant
Cynorkis fastigiata tuberoids.
I do have tons of seeds being sown at a lab though.
They're pretty easy to grow.
If I had to do it over again, I'd grow it with sponge rock, coco coir, and some small limestone chunks. Then for dormancy, I'd pull the tuberoid(s) out of the pot and clean it free of as much potting debris as possible, and store it in an empty clear plastic deli container large enough to fit it in with a few 1/4" holes in the lid, (I think the deli container was especially designed for transporting small lizards or snakes and such, maybe fruitflies, I don't recall). It's not necessary to fill the storage deli container with anything. The tuberoids can take it surprisingly dry during dormancy. Dormant tuberoids can rot out easily if they stay even a slight bit moist for too long. If they get a bit too dry, you can just water the tuberoid and put it back in the deli container.
This is basically what I did with
Cynorkis angustipetala. Not only did I do what I outlined above with my
Cynorkis angustipetala, I just had the deli container with the tuberoid in it in my bedroom on top of my desk with no special set-up. Because I wanted to clean my room up, I placed the deli cup with the tuberoid on a rack in my bathroom. It really didn't care either way, and I imagine
Cynorkis fastigiata to be the same way, or at least, it'll probably behave somewhat similarly. I just wanted to clarify that me putting the dormant
Cynorkis angustipetala tuberoid in the bathroom was not really a strategic move to grow the orchid properly, it was because I wanted a clean bedroom to sleep in.
The temperature that I keep the dormant
Cynorkis angustipetala in is about 65 F - 75 F, I imagine
Cynorkis fastigiata can be treated the same way, or at least, similarly.
A few words about when to pull the tuberoid(s) out of the pot…
You can either pull them out of the pot when a large majority of the leaves have died back, and the few remaining leaves are turning yellow despite the stem still staying securely attached to the tuberoid(s), or you may wait until the first opportunity the stem comes off the tuberoids to pull them out, however way the plant behaves first or whichever method you prefer is fine.