Blue Nemesia.

Hi! I have two ‘recumbent pots’ with blue nemesias. They have survived the -7.9° we had recently, and look quite splendid with still the odd flower!
should I leave them, where they are, and do I need to cut them back, now or in the spring?

 

I haven´t grown these plants before but if they have survived the temps you say then I would say leave things well alone till the spring when you could probably cut them back.