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Greenhouse fabric?

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Re: Greenhouse fabric?

Post  sanderson on 11/20/2013, 9:42 pm

Applegate,  That is so neat!  Looks so comfy inside.
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Re: Greenhouse fabric?

Post  has55 on 11/21/2013, 7:13 am

applegate, the GH is awesome. So is the daikon radishes.
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Re: Greenhouse fabric?

Post  Pollinator on 11/21/2013, 10:42 am

@boffer wrote:I originally covered my hoop houses with 6 mil 'clear' plastic from the big box stores.  In less than a year, the plastic was nearly opaque white.  After three years, the plastic started getting brittle and cracking/breaking here and there, and I started to replace the plastic as it deteriorated.  

Two year ago, I made a greenhouse and covered it with clear greenhouse plastic from Farmtek.  It's not clear as glass, but I can identify plants and people when looking through it.   
https://www.farmtek.com/farm/supplies/ProductDisplay?catalogId=10001&productId=358910&pageId=ItemDetail&isDoc=N

It's still clear as new, and just as supple.
There is a tradeoff here. The Ultraviolet-protected plastic sheeting will last longer, but it also means that the plants inside are not exposed to UV light. If you use the greenhouse for starter plants in the spring, they have to be "hardened" before they can be set out. With regular polyethylene, they get the UV light and do not need hardening.

Since I don't have time for twice-daily trips carrying hundreds of plants in and out of the greenhouse, I stay with the regular polyethylene, and plan to replace it when it gets brittle. The materials cost comes out about the same, as the regular sheeting is much cheaper.

Also I've tried both 4 and 6 mil - my thinking was that the six mil would last longer, but experience has shown its life to be about the same, so now I'm using only 4 mil, and saving more money.

Moral of the story: if you purchase the UV-protected greenhouse sheeting, be aware that you will have to spend a lot more time hardening off started plants. If you take plants from the greenhouse and put them into sunshine, they will rapidly sunburn and may be killed. So you have to take them out for a brief exposure the first day; then a little longer each day; until the plants can stand the direct sunshine.

I take mine from the greenhouse and put them out for good, as soon as the weather will permit. No hardening needed. They only need an overnight trip back inside if a late frost threatens.
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Re: Greenhouse fabric?

Post  has55 on 11/21/2013, 12:29 pm

Thank you Pollinator. extremely helpful and insightful. Add info I need before I purchase my plastic.
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Re: Greenhouse fabric?

Post  Turan on 11/21/2013, 1:31 pm

I have used my hoop house covered with greenhouse film from Farmtek for 5 years to harden off plants in the spring. I have not had a sunburn problem after putting them out in the regular garden. I am higher elevation than Pollinator so supposedly more UV. I suspect that I am usually doing an intermediary step by covering newly transplanted plants with reemay for a day or so. Or longer in the early spring seeing as it will snow as soon as I plant something.....Laughing 
Maybe sunburn is just less of a problem in the weak sunshine of a northern spring?

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Re: Greenhouse fabric?

Post  boffer on 11/21/2013, 4:45 pm

I start all my seedlings indoors under lights and don't bother with hardening off when I plant them outdoors. I guess that's one advantage about my typically cool and damp climate. Very Happy 
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Re: Greenhouse fabric?

Post  Marc Iverson on 11/24/2013, 2:06 am

That greenhouse looks better than some apartments I've lived in!
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Re: Greenhouse fabric?

Post  sanderson on 11/24/2013, 2:31 am

Very Happy
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Re: Greenhouse fabric?

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