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overwintering Over wintering

Has anyone tried to over winter pepper plants in a raised bed? I have a raised bed with pvc loops with some mesh to keep the birds out. If I replace the mesh with clear plastic would it work?
 
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I am in central Cali, right now the night time temps don't go below 50%, in the winter the go down to high 20's to low 30's
 
If the ground freezes they're doomed, with a few frosts they might lose their leaves and not be too happy about it.  I'm not able to leave mine outside in Virginia without a heated greenhouse.  I wouldn't attempt it in my location since we get temperatures as low as 0F sometimes in Jan-Feb and there wouldn't be much to keep the raised bed from freezing.  Might be ok in California, there are likely some members here who have tried it who live there.
 
Salinas doesn't get bitterly cold.  Mid 20s is about it, right?   I think you've got good chances...
You can get thin vinyl sheets at the local hardware store.  Throw in a few water containers, painted black, to soak and hold as much heat as possible.  Drag out an electric heater if it gets too cold.  A radiant heater, elevated and pointed down at the ground from a distance, might work quite well.
 
I know your climate pretty well, as its almost the same as mine. Depends a lot on the species if we're talking pubescens or certain annums its doable. If its chinense its gonna be tuff. Also depends if you are willing to do what it takes to keep them warm thru the multiple cold snaps below 35 degrees. Your micro climate matters too, are you getting full southern exposure of the low angled winter sun?
 
tip for keeping warm:  sealed black containers full of water absorb the suns energy during the day and release it at night to keep them warm, preferably five gallons or more.
 
LOL i see Geonard beat me to black water trick.   Damn I type slow.
 
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