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diurnal variations

This is a discussion on diurnal variations within the New Growers: Ask the Senior Members forums, part of the New Growers category; I'm wondering what the diurnal variations should be for cattleyas, phals & oncidiums? Keeping my ...

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  1. #1
    remo is offline Senior Member
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    cattleya, cymbidium
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    Question diurnal variations

    I'm wondering what the diurnal variations should be for cattleyas, phals & oncidiums? Keeping my greenhouse at 62 at night then 78 thruout the day. What do you guys think?
    Remo

  2. #2
    catttan's Avatar
    catttan is offline Senior Member
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    Yew-Sung
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    Outside 24/7
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    I live almost on the Equator where the diurnal range varies between 6 -8 F and rarely 10 F. I find that cattelyas do very well except the large pink/lavenders which prefer the cooler season at the end and beginning of the year(winter?) to bloom. Even during the cooler season the diurnal range remains the same. The same goes for phals - the pinks preferring cooler conditions rather than a big diurnal range.

    Remember I live at the Equator where we can grow 24/7 outdoors. Some people here I talked to,say that your growing conditions seem to be ideal for all the orchids you mentioned and wished we could replicate it and that then we would be able to bloom some of our highland paphs.

  3. #3
    remo is offline Senior Member
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    Thanks, Yew.
    I've always heard that a pretty wide temperature swing was ideal, especially to initiate a bloom. Well, this is a new system for me so I guess we will know soon.
    Thanks again, Remo.

  4. #4
    Brutal_Dreamer's Avatar
    Brutal_Dreamer is offline Dreaming with my eyes open...
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    Bruce Brown
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    A difference of + - ten degrees should be enough in most cases. Some of the orchids that need a serious cool down might require more, but your range seems more that adequate. Good luck Remo!

    Cheers,
    BD

  5. #5
    remo is offline Senior Member
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    Thanks, Bruce. I'll let you all know how it works out.
    Remo

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