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  • 2 Post By 78Terp
  • 1 Post By phalspital
  • 1 Post By Carolla

temperature changes with orchids?

This is a discussion on temperature changes with orchids? within the New Growers: Ask the Senior Members forums, part of the New Growers category; Some nights here are above 55 some are lower. On thenights it is lower, i ...

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  1. #1
    barbara winter is offline Junior Member
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    Default temperature changes with orchids?

    Some nights here are above 55 some are lower. On thenights it is lower, i havebeen keeping my phal. Inside. Will this be enough tobring on a spike. Or what should i do for constant night temps? I am in upstate S.C.
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  2. #2
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    Generally, a 15 degree F temp change is needed. Don't go below 55 F with your phals. Some may say 60 F.

  3. #3
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    chemist is offline Senior Member
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    Some people saying not necessary drop between day and night temperature needed but overall day temperature drop for about a month.
    My summer temp was about 85F on average during day and at night only few degree lower 75-80 ( i did not run ac). In September and October temperature dropped to 70 and 60F. I kept windows open at night so coolest temp was 58F.
    Three of my phals put new spikes 2 weeks ago. Others still blooming.
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  4. #4
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    There is an interesting article in Novembers AOS Magazine.

    It talks about the benefits to all orchids having lower night time temperatures all year long. It helps all orchids bloom more often and better by having that temp difference. Especially down to 60 F.

  5. #5
    chemist's Avatar
    chemist is offline Senior Member
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    Thats probably true Harvey, but in my case running AC in summer meant very low humidity, so here is a question what whould be better for orchid 60f at night or humidity higher than 40%?
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  6. #6
    78Terp's Avatar
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    I think 60 F at night would be best after reading the AOS Orchid mag article.

    This is quoted from AOS 'Orchids' magazine, 'Why Orchids Need a Drop in Nighttime Temperature' by Sue Bottom, Nov 2014, pg 654

    "ORCHIDS BY NIGHT. At night, photosynthesis stops but growth and respiration continue drawing on the energy reserves created during the day. Respiration occurs more quickly at higher temperatures than at lower temperatures. At lower temperatures, it is possible for the energy consumption to be less than energy production, allowing the plant to store energy for future use, including flowering. If night temperatures are too high, food is used faster than it can be made so growth is poor and orchids either do not flower or flower poorly."

    What do you think of this? It may explain my success from the start. I have been doing the temp change since last October on, just as I was starting my serious orchid addiction.

  7. #7
    barbara winter is offline Junior Member
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    What is the feedback on putting ice in pan around plant in order to lower temps inside for winter rest? I am trying to get the correct length of time tto winterize my phal. It has gotten way too cold day and night to put it outside now.
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  8. #8
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    My phals endure high-70s nights all summer, when days are routinely 90. This year, with the early fall, they got down to the 60s at night and high 70s day back in October, and that was enough to set the whole shebang spiking wildly...I have 20 in spike now.

  9. #9
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    Another thing to keep in mind is that Phals are generally warm liking plants and don't care for chilled roots. I'm not so sure about ice near the roots at night, but you might cool a general area somewhat? Most of mine do bloom without any special care, it's just naturally cooler in the winter (despite heating and cooling the house) when the outside temps go from 100 or so during the days to the 20's like now... As for low humidity I have little choice, its just dry here, if the plant can't take it, I don't grow it. I find my Phals to be pretty adaptive to low humidity and pretty tough over all, as long as I don't rot them. I suspect I'd get better blooms if I messed with the temperatures more, but I get enough to keep us happy and flowers on the table pretty much year 'round.

  10. #10
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    I have never gotten better results from my orchids since growing outside for the last two years... I'm talking about massive payload on spikes more than one on all plants. Increase vigour, i'm totally blown away at how much increased light , diurnal temperature and fresh air flow does to these plants.. They are designed to be out... However as the greenhouse outside is not heated I will have to over winter my intermediate and warm growing orchids inside (Phals etc )
    Which is ok as this is the time they are blooming so i get to enjoy. Until that sun comes back around at the end of the year for them to enjoy..

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