There’s such a thing as freeze damage, which occurs in trees internally. This is quite common in trees that are only conducive to tropical climates. An example of this would be the citrus tree. “Freeze damage on citrus trees occur 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.” As long as the damage is not too severe, trees normally recover from freeze damage. As far as trees freezing are concerned, this may be just about it. There aren’t any known cases of trees actually freezing or turning into ice. Usually they appear the same from the outside regardless of how cold it is, but the damage happens inside the tree.
Yes they can! When the water inside leaves, trunks, and stems freezes, it expands, which often causes rupturing of the membranes in the tree. Some trees drop off its leaves and enter dormancy in the winter months to protect themselves. Some increase the salt and sugar contents on their cells to lower the freezing point of water in their cells. Some trees that are particularly vulnerable to freezing are citrus and cialis types.
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