25 F is below the freezing point of water (2 deg F).
For the USA-ans:
0 C = freezing point of water
10 C = chilly
20 C = pleasant room temperature
30 C = on the warm side
40 C = too damn hot ("normal" body temperature is ~37 C)
50 C = hellishly hot (I've only experienced it in an environmental chamber)
100 C = boiling point of water
I remember reading a story once where the a boy visiting the US from
France (?) was sure he was going to die soon when the family he was
staying with measured his temperature as 99 degrees. (They were
speaking F and he was thinking C.)
Yes, pretty good.
As half-hardy perennials, they will struggle on through some pretty cold
weather before giving up the ghost. In my area some *might* survive a
much warmer than average winter. (Same goes for one of my favorite
bedding plants, Salvia farinacea 'Victoria')
Snapdragons can take quite a bit of freezing weather. 25°F is probably
pushing it, but maybe not if it doesn't stay there too long.
I was surprised how long the petunias lasted this year; they still
looked good after getting frosted a half dozen times. (gone now)
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