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Sunlight and blooming

This is a discussion on Sunlight and blooming within the General Orchid Culture forums, part of the Orchid Culture category; I know that not enough sunlight (or light in general) can prevent blooming in orchids, ...

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  1. #1
    Monks-in-Miami is offline Senior Member
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    Default Sunlight and blooming

    I know that not enough sunlight (or light in general) can prevent blooming in orchids, but can being exposed to too much light also prevent an otherwise healthy orchid (that is growing new roots and leaves) from spiking and blooming? Just curious. Thanks.

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    Chris in Hamilton's Avatar
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    Yes. Either the light being too strong or too many hours of light. Even light interrupting the night hours can do it

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    ksriramkumar is offline Senior Member
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    Concur with Chris. Some of them bloom based on change in number of hours of sunlight

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    As orchids are "niche plants," if you can look into the conditions of their natural habitat, it'll give you a good idea of what is likely to be acceptable, although there is generally some leeway.

    There are chemical processes within the plants that are favored, even "driven," by light, and some that happen when it's dark, and each plant has a balance in the relative rates that they occur. Artificially tip that balance, and it can definitely have an impact.

    One really good example is the average phalaenopsis - it can be grown very brightly (if you transition it well so it doesn't burn), but the blooming with be infrequent and inferior. On the other hand, if you give it time to adjust, they can do well with very low light. I've probably mentioned it before, but some of the best blooming phals I've ever seen were in a hot, humid greenhouse that was SO algae-covered, that it was almost pitch black inside!

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    Monks-in-Miami is offline Senior Member
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    I was just wondering because I have three vanda cuttings that I bought in May 2015. All are in the same location and get exposed to the light that varies from full sun to filtered sun throughout the day. So far only one has bloomed (just within the last six weeks or so), while the others have not shown any signs of blooming even though they have been growing new roots and leaves.

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    Are they they same types/species of vanda? Some seem to take a bit longer to reach bloom size.

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    I'm having a problem with my Phal. now in that when I moved them to the basement the spikes seem to have slowed right down in their development. The lights are set for 14 hours but I'm thinking I may have to cut back for them to flower properly.

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    What's the temperature, Chris? Once the spikes are initiated, "hot" is best.

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    Thanks Ray. Not sure how I'm going to do that without moving them back upstairs but I'll figure something out. The spot they are is around 62F during their night and 68 their day.

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    It isn't warm enough for them during the day.

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