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I can recall seeing citrus growers with these big heaters out in the fields, i recall them spraying the trees down with water so the ice would protect the plans (i dont get it but ok) and seeing ice on oranges. so it had to get below 32 for that to happen.
I have pictures of me as a kid playing in snow in Panama City Beach-on the beach.
does not feel like global warming in DC-i belive someone told me the River is frozen over. burrrrr
They spray the trees with water so that the water freezes first and not the fruit. The ice then actually acts as insulation from further damage. I had to do this a few times when I worked at a nursery in HS for some of our more delicate plants. The "smudge" pots also act to draw moisture out of the air by attracting it to the particles in the "smudge". The "smudge' also makes the air drier and therefore warmer for plants(at least that's what i have been told, could be an old farmer's tale)
It's all because the ice caps are melting...it's got to have something to do with this cold weather. The Delaware River is frozen 2' thick. The Coast Guard was out there last night breaking the ice so the ships could get into port.