3 votes
Accepted

Are green plastic bottles suitable for making a cold frame/greenhouse?

A clear film will transmit the most amount of light. Blue and green coloured plastics will transmit a lot of the light in the blue to blue-green wavelengths, but cut out much of the light in the red ...
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1 vote

Cold frame for starting seedlings

Cold frames work very well with one giant caution; They will get to very high temperature very fast when the sun hits them ( real greenhouse effect). I built one in zone 5 with a home-made operator ...
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  • 7,736
1 vote

Cold frame for starting seedlings

Your link points to images which show mostly the upright type of cold frame; I have no experience with these but do have some experience with the flat horizontal type, so take my comments with this in ...
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1 vote

What thickness of twinwall polycarbonate should I use for my greenhouse?

It seems to me 4 mm and 6 mm sheets are mostly not very sturdy? You need quite some framing to get it halfway stable and even then they can be destroyed quickly. Most 10 mm sheets are stable enough, ...
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  • 11

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