"Alan Meyer" schreef
Now why didn't I think of that?

Actually, I could see that there could be something to this.
If the plant synthesizes alcohols or other low freezing point
liquids that are dissolved in the cytosol, that would significantly
lower freezing point - assuming the plant could tolerate it.

It would also be relevant to know how the freezing point of
the cytosol is affected by all of the solutes since any solution
should have a lower freezing point than pure water.

However it would be awfully useful if someone who actually
knows the answer were to chime in.

***
Actually, I am not yoking. It is not necessary: truth is stranger than
fiction.

One such usage of anti-freeze is that some evergreens use monosaccharides
instead of disaccharides: this lowers the freezing point of the leaves.
PvR