Leaf drop stimuli??

[Mark V]

In the case of Zygo. Kiwi Geyser , Murry what do you think? The large leaves on the pseudo bulb are yellowing and I think are getting ready to fall, and some of the lower leaves on the new growth are also yellowing. Since there are 14 new shoots it is going to take two or three years to bring this plant to flower. Could I fool it with grow lights to keepit growing or does it need this cycle to develop? Her's a pic of the plant. Any other advice from Zygo lovers is welcome.