I don't know
how many or what size trees you need to protect. I've protected single
trees from much colder weather with a light bulb hung in the branches and a
sheet. Most citrus we grow here in northern CA should be able to survive a
few nights in the twenties just fine. Some of the mandarin (and other
citrus) orchards are up Highway 80 in Newcastle, where this is a more common
occurrence.
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