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  • 1 Post By 78Terp
  • 1 Post By kspalding

low temps for orchids

This is a discussion on low temps for orchids within the New Growers: Ask the Senior Members forums, part of the New Growers category; I have central heat at 70 around the clock. I have been putting my phal ...

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  1. #1
    barbara winter is offline Junior Member
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    Default low temps for orchids

    I have central heat at 70 around the clock. I have been putting my phal. Orchid outside at night as low as 55. We,re having a cold snap. The nights are too cold 32. To make sure my orchid gets cool temps for a month would it be ok to put it outside in daytime 55-70. And bring it in at night? I do have an unheated storage room. On tthose cold nights do you think it would get too cold in there for it? I din,t have an outside thermometer. Tell me what to do to make sure my phal. Gets enough cool air to make it spike. I love my orchid and want desperately to make it bloom. Thanks for the help.
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  2. #2
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    Phals will be unhappy under 60 F. A couple degrees below 60 is ok but I wouldn't go below 55 ever for a phal.

  3. #3
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    kspalding is offline Senior Member
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    Sounds like you live close to me. Im not sure what difference it would make to alternate as a way to maintain proper temps. I think as long as watering, temp, and lighting are still maintained the orchid will continue on.

    ---------- Post Merged at 02:37 PM ----------

    Obviously just avoid direct sun when outdoors during the day.

  4. #4
    PaphMadMan is offline Senior Member
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    As I understand it, what triggers flowering in those Phals that need cool temps is the temperature drop at night, cycling between warmer days (70F +) and distinctly cooler nights (60F). I don't think constant cool temps, or reverse cycling of light and temps that are out of sync will necessarily do it.

  5. #5
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    Cjcorner is offline Senior Member
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    For the larger greenhouses that grow Phal's, they have a large room that is kept around 55 degrees at night to promote spiking. While some phals will bloom over and over without the temperature change, most need it. I find putting them in the garage and only watering every two weeks can give me spikes, but be careful with watering since going colder can also come with more bacterial infections and crown rot. Make sure and keep those wayward drops of water out of the leaf axils and the crown...a twisted paper towel is great for drying up any water that drips into those areas.

  6. #6
    Carolla's Avatar
    Carolla is offline Senior Member
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    About half of mine bloom on any given year. I don't go to any great lengths to lower the temperature, but the ones by the window do seem to spike more than the ones under the lights. They have more light (morning) and probably a bit of a drop in temperature by the window. However my house is kept rather warm for my almost 90 yr old mother in law, who lives with us. In fact, we keep it 70 at night and 71 during the day at the thermostat. The house is rather large, so that varies by the area of the house you are in. Personally, I'd keep them warmer than 55, I'd hate to kill my Phal trying to bloom it. I've read up a lot on how to bloom them and the current thought seems to be to lower the temp about 10 - 15 degrees from what is normal in the summer in general for a few weeks (for those that need it) and that most of the modern hybrids are fine without being cooled.

    I have four of them starting to spike this week, so I'm pretty excited. I moved one (rescue) I've never seen bloom to the window from under the lights in hopes it will join the party.

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