combatting the freeze

I live in a citrus growing region and they use to use smudge pots all the time. I believe they are illegal to burn now though. For a while you could find all the smudge pots piled up on the side of the road by the groves free for the taking but they're difficult to come by now. A lot of people like to paint them and use them for decoration in their yards. Now I believe they use giant fans set just above the canopy to prevent the frost from settling.
 
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