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  • 1 Post By raybark
  • 1 Post By Welfkoondo

Oncidium Buds not opening

This is a discussion on Oncidium Buds not opening within the Genus Specific forums, part of the Orchid Culture category; Help please - I'm a fairly experienced grower although only 3-5 years w/ Oncidium Intergenerics. ...

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  1. #1
    Welfkoondo is offline Junior Member
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    Default Oncidium Buds not opening

    Help please - I'm a fairly experienced grower although only 3-5 years w/ Oncidium Intergenerics. Over the last few months my Intergeneric buds have stopped opening. I see several things:
    1) Several petals will open but not all,
    2) Buds never fully develop or open (pictures attached), or
    3) Spikes turn yellow and dry up.

    This is even happening with some of my "old reliables" which have never struggled before. One of them had already opened 4-5 spikes successfully then started doing this. I recently had a Paph also do this - bud got very large then wouldn't open and turned brown.

    Any ideas?

    Thanks!
    Welfkoondo

  2. #2
    raybark's Avatar
    raybark is offline Senior Member
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    Default

    In my experience - and how I interpret what I'm seeing, of course - the are two primary factors that affect bud development and opening: hydrostatic pressure within the plant, and humidity.

    By using an open, moisture-retentive medium, and watering heavily, the plant can "pump itself up" without effort, and the humidity helps keep the flower segments supple, and as the surfaces can more easily retain water in their cells, making them smoother and easier to slide apart.

    And then, sometimes there are mites...

  3. #3
    Welfkoondo is offline Junior Member
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    Default

    Thanks Ray. They are growing in coconut chunks w perlite and charcoal. I tried flushing them with rainwater. Also tried supplemental magnesium. Tested my rainwater which was at 7.0 pH. I thought about mites - can't spot any, but still think I have some generally as new leaves have shown lots of stippling. Very disheartening to wait a year and then have them abort :-(

  4. #4
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    leafmite is offline Senior Member
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    It is always disappointing not to get to enjoy the flowers. More information might help to diagnose the problem.

  5. #5
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    I had Oncidiums being attacked by bugs which I have no idea what they were. They were especially getting to Oncidium spikes and phal buds. I began spraying with an acephate based insecticide and now those same orchids are now able to bloom.

    It is worth a try. One one of my affected Onc's, I pulled back the covering of where the buds emerge and it was just mush. Now it has flowers at the end of the spike.

  6. #6
    Welfkoondo is offline Junior Member
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    Thanks 78Terp - I will give that a try!

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