"Bookworm" wrote in message
...
I have a yellow Argyranthemum in a pot outside my front door that is
still holding on even though we have had frosts down to about -3c.
They are said to be tender. Are they developing a tendency to be
slightly hardy?

It may well be that your plant is being shaded by the house somewhat and
also that some warmth is percolating to it from the warm house. Every
little helps.

Regards,
Emrys Davies.