Leaf drop stimuli??

[orchid-man]

no one is realy sure,as it is different for all species,but more than likely to be day lenght

[Piper]

I think it's a combination, just as it is with deciduous trees. Each fall, leaves may drop earlier or later, depending on the temperature.

I have a semi-deciduous Lycaste that's begun dropping its leaves. We've had some very cool weather the last few weeks and it noticed.

McJulie

[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.

[orchid-man]

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.

There are several things that I see from that photo ,

1) the pot is way to big .The pot should only be big enough to allow 1-2 years growth.But in saying that the pot should also fit like a hat on the roots.

2)The new growths arent far off putting up the spike if the plant is mature enough .

3)the top of the potting medium looks too dry,this will stop the roots from wanting to tough the mix as it will remove the moisture from the roots.

The growing requirements for Zygos,from a major breeder.Grow these plants with your cymbids,cool, shady,and moist.With that in mind I have been looking after about 160 for my son and they are growing under 2 tiers on Odonts under 70% shade .They are never allowed to dry out just like the Odnts, infact when the Odnts are misted daily they get the water as well.
Heres a link that shows a plant growing ensitu

http://www.orchidspecies.com/orphotd...ntermedium.jpg