By Derekpugh
Caerphilly,
United Kingdom 
When do you prone lupins
21 Jul, 2016
Answers
yes it is a herbaceous perennial so all you need to do is remove the dead flower spikes. in the autumn the foliage pretty much dies back to ground level. it will emerge again in spring but watch out for slug damage.
welcome to GoY too :o)
21 Jul, 2016
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Just take off the spent flower heads as they get tatty.
21 Jul, 2016