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  • 1 Post By tucker85

shade cloth question for cattleya orchidss

This is a discussion on shade cloth question for cattleya orchidss within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; Hi, I am in Houston and my patio receives about 4 hours of intense afternoon ...

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  1. #1
    clay576 is offline Junior Member
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    Default shade cloth question for cattleya orchidss

    Hi,

    I am in Houston and my patio receives about 4 hours of intense afternoon sun, shaded in morning though unfortunately. I had 40 percent cloth over all my cattleyas but I'm noticing there's some sunburn showing up. Does sunburn show up immediately or does it take a couple days? Also, I recenlty just added another layer of the 40 shade cloth. What percentage of coverage do I now have? I realize this is probably a simple math equation but I'm not sure how to calculate it. I realize it's not 40+40 = 80%. Anyway, thanks for any help.

    Clay

  2. #2
    Miller's Avatar
    Miller is offline Senior Member
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    I am considering putting shade cloth over my orchids on my deck as well. The arbor covering gives them dapple lighting mid day but some orchids still received some damage on their leaves. I too am in Houston and the morning light is great on my deck but there is a bit of afternoon sun that creeps in between my arbor covering and the neighbors trees. How do you have your shade cloth setup? Would you be willing to post some pictures?

    Thanks,
    Miller

  3. #3
    Halloamey's Avatar
    Halloamey is offline Senior Member
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    The calculation part is easy, as you thought 40+40 is not equal to 80 in this case.
    Consider there are 100 photons of light coming from the source of light to your plants.
    Now you have a 40% shadecloth, that means it allows 60% of the light to pass
    Therefore 60% of the 100 photons = 60 photons pass the shadecloth
    Now you have another layer of 40% shadecloth, it allows 60% of the 60 photons to pass through it
    Therefore 60% of 60 photons = 36 photons pass through finally to your plants
    That is finally your double layer of shadecloth allowed 36 of the 100 photons through i.e. 64% shade.

  4. #4
    Halloamey's Avatar
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    Quote Originally Posted by clay576 View Post
    Hi,

    I am in Houston and my patio receives about 4 hours of intense afternoon sun, shaded in morning though unfortunately. I had 40 percent cloth over all my cattleyas but I'm noticing there's some sunburn showing up. Does sunburn show up immediately or does it take a couple days?
    Clay
    Sun burn can show up immediately or can take a couple of days depending on the temperatures, humidity and air movement around the leaves. You can look up some recent posts about similar questions, one nice link would be from the AOS about the right light, here it is

    AOS Beginners Newsletter

    If your conditions are a bit drier and there is less air movement I would recommend the filtered light conditions illustrated in the article, but if you can provide enough humidity (>60%) and good air movement then bright light as illustrated in the article will benefit the Catts.

  5. #5
    clay576 is offline Junior Member
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    Default

    perfect! ok then
    I did the calculation right. Down here in Houston, apparently I need that much shade for afternoon full sun. Does this sound right? I thought 40 percent, one layer, would be enough, but not so since they started sunburning. Thanks for the help.

  6. #6
    tucker85's Avatar
    tucker85 is offline Senior Member
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    40% shade should actually be pretty good for most cattleyas. But if they aren't used to it, they'll burn. They'll usually show signs of burning within 24 hours. If you want to use that shadecloth, put the orchids out there for an hour a day, for a couple of days and slowly increase the time. You can mist the leaves to keep them from burning also.

  7. #7
    Kmac's Avatar
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    I just put up shadecloth for my catts. I debated between 50% and 60%, and finally settled on 60%, since Texas sun is pretty strong, and this spot will get sun most of the day. So far, all I know is that nothing is burning...too early to be sure its enough light, but it seems pretty bright. Well see. Let us know how yours does.

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