You want to wait until the newest matured pbulb has started growing roots. That is the best time to repot. ASs long as you don't disturb the roots too much you can repot even when the pbulbs are in sheath. The flowers are dependant on the pbulbs to open not the roots per se. Again, as long as you don't disturb the roots too much. And you should have at least 4 or 5 bbulbs to get the most out of then division the quickest. If your growing area is very condusive to catts then 3 or 4 would be ok. Repotting at any other time will set the orchid back. Maybe keep it from flowering for a year or three. I have repotted in every month due to unusual circumstances and found that they do best potted when there is new roots growing. There is another way to get the plant ready to divide and repot. Count back from the newest pbulb, find the rizome, now with a clean razor blade, cut halfway through the rizome. If you can cut an actual notch into the rizome about halfway through, you will get the latent buds on all the bbulbs to grow start growing. I just cut mine once halfwat through and nearly every time the bbulbs initiate new buds from latent ones.
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