I tried them last year on tomatoes and peppers in zone 6 in the Texas Panhandle and they worked really well, surviving many nights below freezing with no ill effect on the plants.
A few things I would recommend:
1) Use 3 pieces of rebar, dowel rod, pvc, or bamboo tied together to form a tepee to put inside to support it in excessive wind.
2) Push the bottoms out from the inside. That way when it gets hit by the wind, the top closes and absorbs the force. (You can tell we get a lot of wind here)
3) If it is well below freezing, use a large rubber band to seal the top and remove when it warms up.
4) Put a 5 gallon bucket upside down and put the wall o water around it to fill it, then remove the bucket
5) Place them where you are going to plant them several weeks early to warm up the soil
I am trying 62 of them this year between peppers and tomatoes, so I will have a better idea next year how well it works on a larger scale. I am trying to get tomatoes early to avoid the high heat of the summer.
Brian
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