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  • 4 Post By raybark
  • 2 Post By AtantaR
  • 1 Post By kharma

air roots on phals or lack of them

This is a discussion on air roots on phals or lack of them within the General Orchid Culture forums, part of the Orchid Culture category; i have a few phals all new this winter what conditions are conducive to airiel ...

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  1. #1
    kharma is offline Senior Member
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    Default air roots on phals or lack of them

    i have a few phals all new this winter what conditions are conducive to airiel root growth and does a reversal of conditions have an effect on orchids eg. lower temps and high humidity during the day and higher temp and low humidity during the night

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    I think that the tendency of a phalaenopsis to grow aerial roots is more a matter of the need for more water & nutrient uptake and/or mechanical stability, than growing conditions, but the inverted temperature/humidity profile concerns me.

    There are different chemical processes that go on within a plant in daylight and in the dark. All such processes are temperature rate-controlled to some extent, so your conditions might be suppressing the daytime one and accelerating the nighttime ones. Further, phalaenopsis are CAM plants, so their leaf stomata are only open at night, when the relative humidity is normally naturally higher, and the loss of water through the stomata is reduced. Depending upon just how low, your low humidity at night is, you might be risking excessive water loss.

    Having stated all that, yet knowing that plants can be pretty adaptable, I recommend you simply not worry about it, but be observant of the plant, adjusting as needed.

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    i agree with what was said. Its humidity that makes those roots grow, everywhere for that matter!!..dry conditions will make them grow toward water and/or out of dry pots more often than not..and to much water for to long..well, we all know that one. Were you looking to not have Arial roots? was that the question? Because i almost think that its impossible to not have arial roots at some point with an extremely happy productive plant..lol

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    kharma is offline Senior Member
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    Quote Originally Posted by raybark View Post
    I think that the tendency of a phalaenopsis to grow aerial roots is more a matter of the need for more water & nutrient uptake and/or mechanical stability, than growing conditions, but the inverted temperature/humidity profile concerns me.

    There are different chemical processes that go on within a plant in daylight and in the dark. All such processes are temperature rate-controlled to some extent, so your conditions might be suppressing the daytime one and accelerating the nighttime ones. Further, phalaenopsis are CAM plants, so their leaf stomata are only open at night, when the relative humidity is normally naturally higher, and the loss of water through the stomata is reduced. Depending upon just how low, your low humidity at night is, you might be risking excessive water loss.

    Having stated all that, yet knowing that plants can be pretty adaptable, I recommend you simply not worry about it, but be observant of the plant, adjusting as needed.
    the reason for the reverse temps are its winter here and they are in a laundry at night with 3 dogs and a oil column heater to keep the dogs warm and it gets turned off during the day as the dogs aren't in there so its about 20c at night and about 10 - 15c during the day humidity is fairly constant at about 60 - 80 % depending on the natural levels it is boosted by a humidifyer 24/7 as the weather warms up at night the heater will be turned off and temps will go back to a normal day night range. so from what your saying the air roots are hunting
    thanx that is very helpful

    thanx atantar
    i was under the impression to have a healthy phal air roots were a must i was hoping to encourage some to grow in the warmer months here so was looking for the right conditions to give them for this to happen i live in a cool dry climate with very little humidity in spring summer and autumn but plenty in winter though siuts me just fine i hate it but i'm not an orchid

    ---------- Post Merged at 09:17 PM ----------

    thanx raybark
    the reason for the reverse temps is its winter here and temps get down to -7 at night and the phals live in the laundry with 3 dogs at night with a column oil heater so they have a night temp of 20c at night and a day temp of 10 - 15c with a humidity range of 60 -80% with the help of a humidifier depending on natural levels. the heater is turned off during the day as the dogs aren't in there. when the night temps come up above 5c the heater will be turned off and temps will be at a more normal range

  5. #5
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    I've never really worried about air roots one way or the other. Most of my Phals get them, I just figured they were normal as a plant grows bigger and I think they look cool crawling around... If your plant is growing well, then no worries!

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