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Phal buds dropping

This is a discussion on Phal buds dropping within the General Orchid Culture forums, part of the Orchid Culture category; I never thought I would ask help for this..lol Anyway, heres the problem. I had ...

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  1. #1
    Tanya's Avatar
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    Default Phal buds dropping

    I never thought I would ask help for this..lol
    Anyway, heres the problem. I had been growing some of my hybrid Phals outside this year due to space problem indoors. The plants are healthy, grow their spike on schedule, and then when the buds reach thumbnail size, they started dropping one by one. The buds are still firm when they drop, not yellowing or soft like the way they do when blasted. I didn't moved the plant either. First I thought maybe it caused by an insect? But the buds are undamaged, they just drop clean, still fresh. Maybe birds?
    I appreciate any opinions.

  2. #2
    Hoa Tony Nguyen's Avatar
    Hoa Tony Nguyen is offline Senior Member
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    Hi Tanya!
    For phals, I believe sudden buds drop are due to
    1) Temperture gets too high during bud forming and flowering (I believe <76 F is best, higher than 80 F will cause bud drop almost immediately since it makes the plant thinks it's growing time, not flowering time.
    2) Large fluctuation in temperature. If the difference in daytime and night time temperature is too large, the buds drop too. Phals and other orchids like them like temperatures vary in quite a narrow range. Orchids with pseudobulbs often like and tolerate a larger day/night temperature difference.
    Cheers. Hoa.

  3. #3
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    Hi Tanya,

    One other thought - are any fruit nearby? Or exhaust? Ethylene will stimulate flower drop and it's given off by maturing fruit and incomplete combustion (like from a fireplace or poorly vented stove or heater.)

    I've told this story in some buried post, but right after college I helped out in an apple stand. The owner also had a greenhouse and brought all his mums down to sell, as well. With a cold night forecasted, he moved all the plants into the apple stand before we locked up. The next morning every petal on every mum had dropped prematurely. It was the ethylene given off by all the apples in an unvented room.

    Just a thought.

    Julie

  4. #4
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    wow, Now I know I gotta watch out for my fruit fly culture which I use to feed my little toads. The media in them smells very alcoholy. But only if open it.

  5. #5
    Tanya's Avatar
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    Thanks all for the ideas. If its not birds, then maybe the temperature changes. During this time of the year, sometimes it gets as warm as early summer, sometime it suddenly drop, causing me to dig up my winter clothes again. No harmful gas up there on the roof where I grow my orchids, just strong winds sometimes.

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