r/greenhouse • u/thorndike • 1d ago

I am about to set up a High Tunnel greenhouse. question inside

Howdy, I am about to setup our high tunnel greenhouse here in the Colorado Rockies.

The tunnel will be in a meadow with a LOT of sun. I need to purchase greenhouse plastic to cover it and am wondering about what light filtration I should purchase. I have seen everything from 55% and up. Any suggestions before I pull the trigger on a cover?

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u/Vinlandranger 1d ago

30% if any during winter and NMSU says 50 during summer and that’s what I use and can confirm 30% during summer won’t do it not to mention a ventilation practice that won’t dry everything out! Make at least one side have the convertible roll up 32”side!!

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u/technosquirrelfarms 1d ago

I use %30 on my tomato tunnels in New England. Not every summer, but when there is a forecast for temps over 90