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Greenhouse Planters-insulate? Depth?

 
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I am building some raised planters today for my greenhouse. I was wondering if there would be a benefit to insulating the sides of the planters with foam insulation? Just thinking it might help to retain heat in the containers?

What would be a good depth for planters?
 
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cattle chicken bee sheep
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Foam over a wood frame? I doubt it. Wood insulates, but I suspect most heat would go straight up.
 
Carolyn Miller
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I was actually thinking of lining the planters with foam-thought there might be two fold benefit-insulation and also protect the wood sides from moisture.
 
wayne fajkus
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Ok. Foam inside wood. Description was vague. I would think water would wick into wood unless all edges contacting dirt was sealed.if bottom still has contact, not sure proofing the sides will help
 
I've read about this kind of thing at the checkout counter. That's where I met this tiny ad:
the permaculture bootcamp in winter
https://permies.com/t/149839/permaculture-projects/permaculture-bootcamp-winter
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