West Sussex,
United Kingdom 
Antirrhinums. I bought 6 tiny plants from a village plant sale last spring and they turned out to be double antirrhinums. They grew and flowered magnificently in early summer and again after dead-heading and are only just going over now. The plants are very healthy looking with lots of lush growth but I don't know whether it is worth leaving them in, whether they would survive frosts, or whether to pull them up?
15 Nov, 2018
Answers
That's very helpful, thank you. I'll leave them in!
15 Nov, 2018
if its a mild winter they will happily survive. the flowers that you still have may go on to produce seed. I haven't grown any from seed for 7 yrs now as they self sow freely. I just pull out what I don't want.
15 Nov, 2018