West Sussex,
United Kingdom 
Erysimums.
Is it possible to propagate these and if so how and when, please?
19 Apr, 2011
Answers
Very easy and a good way to replace them as they get old and straggly or if you loose the odd one. I just choose non flowering pieces and stick them in compost I do over winter mine.
19 Apr, 2011
Thank you--I do love them and they are getting very expensive to replace every two or three years. July it will be!
20 Apr, 2011
Previous question
« Why has my 12 year old magnolia failed to flower this year?
Yes - take cuttings in July.
19 Apr, 2011