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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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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
 
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