Date: Around 1993
Why do some plants freeze and others do not?
The main reason some plants freeze and others do not is that some
plants do not have much water in them. Pine tree leaves have little water and
are therefore difficult to freeze. Another reason is that some plants make
chemicals to put into their fluids that reduce the freezing temperature.
Salts and oils are some. The polyunsaturated fats found in many plants freeze
at a lower temperature than the saturated fats found in many animals.
Therefore plant fats are liquid (oils) at room temperature, and animal fats
are solid. Plants could not use so many saturated fats as warm blooded
animals do or they would freeze up solid at higher temperatures. I know
little of plants but many animals can make ethylene glycol to keep themselves
from freezing. Ethylene glycol is the active ingredient in car anti-freeze.
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Update: June 2012