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Getting Oncidiums to Bloom

This is a discussion on Getting Oncidiums to Bloom within the General Orchid Culture forums, part of the Orchid Culture category; Is there some sort of trick to getting oncidiums to bloom? I have a couple ...

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  1. #1
    dougroc is offline Senior Member
    My Grow Area
    Under Lights.
    Join Date
    Nov 2008
    Rochester, NY

    Default Getting Oncidiums to Bloom

    Is there some sort of trick to getting oncidiums to bloom? I have a couple
    Odcdm. Tiger Crow 'Golden Girl' that are exhibiting robust vegetative growth but haven't bloomed in a long time.

    I grow under lights in the winter and outdoors in the summer. Do these guys require a cold spell or something? How about a bloom-booster fertilizer?

    Any tips would be appreciated.

  2. #2
    gardenguysorchids's Avatar
    gardenguysorchids is offline Don't be afraid to color outside the lines
    Real Name
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    Paphs, Oncidium,and Catts
    Join Date
    Sep 2009
    Mechanicsburg, Pennsylvania
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    Hi, Grow mine the same as you--underlights in my basement in the winter and under a tree during the summer. I fertilize once every two weeks during spring and summer and then cut back to every two weeks in the winter. I also use super thrive with each watering. I grow mine cool in that my basement is unheated . Winter temps are 55 to 65 degrees. I have had great luck with them blooming for me. I only use bloom booster when i see a spike forming. Once the buds start to develope I stop the bloom booster. If you are having robust vegetative growth there is a chance that you may be feeding them too much. That could be a reason for them not blooming for you. I am far from an expert but have had good luck with my Oncidiums growing them as I have stated. Good Luck!

  3. #3
    orchid-man's Avatar
    orchid-man is offline Not Normal
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    Favorite Orchid(s)
    Oncidiums.Odonts and alliance
    Join Date
    Mar 2006
    Auckland new zealand
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    yes there is a little bit of a trick with flowering these inter-generics.
    In No particular order
    1) they do not like high temps - 25 - 28 degrees C , 77- 82degrees F MAX.(one grower I know has temperature controlled misting 24 hours year round)
    2) they also like humidity around the 77 - 85% during growth down to about 60% in the winter.
    3) they love food - a fertilizer high in nitrogen all year round,as they are in growth or flower at any time of the year (they will flower three times in 2 years may even be in growth and flower at the same time) .Feed them about 3-4 times per week - this came be done because of the air flow around the plants.
    4) air movement - this would be one of the most important - if the foliage is moving then there is enough air movement.
    5) Light - here in New Zealand we grow these under 70% shade as we also have very high ultra violet to content with - for you I would say 50% would be enough.This gives me about 20000lux or 1858 foot candles.
    Last edited by orchid-man; August 31st, 2010 at 06:26 AM.

  4. #4
    blrnut is offline Senior Member
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    Outside 24/7
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    Vanda, Dendrobium, Aerid, Phal
    Join Date
    Jul 2009
    Bangalore, India
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    I would also be interested in knowing, as I have a mixed bag with me! 2 of them are in spike for me, but the other 2 are not doing. They have some vegetative growth, but no spikes since the last year or more

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