re: Satsumas and Freezing Temps....

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So if I leave lots of satsuma's on the tree, I won't lose them in 25 degree weather?

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Cold is good but THAT cold, I'd say yes, you'll lose them but there are other variables to consider also. For example, a few days of cold weather before the freeze may better prepare them but 25 degrees is fregin cold.

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“Cold is good for satsumas, it’s what makes them turn sweet, but at the same time it can be devastating,” he said.

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LINK

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Freeze damage on citrus trees occurs when water inside the fruit, leaves, twigs and wood of a tree freezes rupturing the cell membranes. Unlike deciduous trees which protect themselves from cold by shedding their leaves in the fall and entering a dormant state, citrus trees continue growing year-round. Extended periods of cool weather prior to a freeze may allow a citrus tree to prepare somewhat. This is why sharp freezes following warm weather are more damaging than gradual temperature changes. However, virtually all freezes will cause damage of some kind.

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LINK