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Thread: shade cloth vs. tarp

  1. #9
    mass's Avatar
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    It's more of a hoop house than a greenhouse really. Will definitely keep it completely opened on those hot days..
    Thanks for the tip JB.

  2. #10
    Sgt Sarracenia SgtSarracenia's Avatar
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    All of my plants are grown outside here in So Cal. While everyone here is correct that neither tarp nor shade cloth will "cool" the green house, I feel one would help you keep the temps down more so and serve a better purpose. A tarp will shade the greenhouse but trap moisture and heat and not allow light in. Shade cloths come in just about every % rating that you can think of and do not trap much moisture or heat but let enough light through to make sure your plants get as much natural light as possible. I use both 55% and 75%. Between the two I have been able to control my temps quite well.

    Neither will drop your temps below ambient temps, but in my experience shade cloth helps considerably in stopping sunburn and overheating. I find it the most useful in stopping the water in my trays from being heated by the sun. The water stays MUCH cooler using shade cloth.

    That's just my two cents, and you still can't buy bubble gum with it.
    "Only when you live to learn, will you learn to live"
    GROWLIST

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    Quote Originally Posted by SgtSarracenia View Post
    That's just my two cents, and you still can't buy bubble gum with it.
    That made me laugh out loud. Which is saying a lot for 9am..

    Thank you for the input, very informative.
    I have little experience with outdoor growing, and zero experience with shade cloths.
    Question: using 55% and 75% = 105% UV blocked, wouldn't that be like growing plants in the dark?

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    BS Bulldozer SubRosa's Avatar
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    Quote Originally Posted by mass View Post
    That made me laugh out loud. Which is saying a lot for 9am..

    Thank you for the input, very informative.
    I have little experience with outdoor growing, and zero experience with shade cloths.
    Question: using 55% and 75% = 105% UV blocked, wouldn't that be like growing plants in the dark?
    Nope, because the first piece blocks 55% of the available light, leaving 45% of what you started with. The second piece blocks 75% of that remaining light leaving an amount of light you can calculate yourself because I'm still working on my daily caffeine requirement!

  5. #13
    mass's Avatar
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    umm.. I just woke up, but let's see...

    75% of 45% is.. 33%. Leaving a remainder of 12% of light coming through?

    I've also been thinking about adding something like this out there:
    http://www.ebay.com/itm/5M-15FT-gard...item35c4b2f3be

  6. #14
    Sgt Sarracenia SgtSarracenia's Avatar
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    Quote Originally Posted by mass View Post
    That made me laugh out loud. Which is saying a lot for 9am..

    Thank you for the input, very informative.
    I have little experience with outdoor growing, and zero experience with shade cloths.
    Question: using 55% and 75% = 105% UV blocked, wouldn't that be like growing plants in the dark?

    Not together. Some places I use 55% and other places 75%.
    "Only when you live to learn, will you learn to live"
    GROWLIST

  7. #15
    Cardiac Nurse JB_OrchidGuy's Avatar
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    50% should be really all you need for nepenthes and things. Remember these are high blight plants. You trade off less light for cooler temps.

    But with that said...remember I have fans and other forms of cooling going too. My point is you are going to need air movement even in a GH of hoop house situation. Is your hoop house enclosed on the ends? Either way air movement is key. A hoop house is just a type of GH. Neps as I said like high light for the most part and don't like the shade. But its a trade off growing in a little less light for cooler temps. Your going to have to play with it and tweek it to your area. My GH is shaded a little by a tree except during parts of the day. 59% shade is a big deal and some plants had to move to the front of GH where more light gets in. My helis are a prime example. But if I font have the shade cloth then the temps get too hot even with my AC going.

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