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Leaf drop stimuli??

This is a discussion on Leaf drop stimuli?? within the General Orchid Culture forums, part of the Orchid Culture category; On the deciduous and semi-deciduous plants what initiates the leaf drop? Is it temp, day ...

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  1. #1
    Mark V's Avatar
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    Question Leaf drop stimuli??

    On the deciduous and semi-deciduous plants what initiates the leaf drop? Is it temp, day length what?

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

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    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

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    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.
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    Not a Zygo. expert I have one ... they do not go dormant that I know of . The picture looks like it might be 2 things to much light and to dry .
    The bark looks new and won't hold much moisture . Hope this helps a little . Gin

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    The light levels in this pic are only for the pic, Gin. It lives in the shaded area you see in the background. It gets about an hour of direct sun in the early morning. The stick you see in the pot is a bamboo skewer. When I pull it out and it's dry, I water. I mist the plant a couple three times a day.

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    While many of the Zygo hybrids aren't deciduous, some of the species are. Z. maculatum is deciduous I used to have one, and Kiwi Geyser is 25% maculatum. It's also 56% crinitum, but I don't know anything about that species.

    McJulie

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    Quote Originally Posted by Mark V View Post
    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

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    Thanks guys.

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