London, England

I bought a Perovskia "Blue Spire" from my local B&Q Garden Centre's reduced section, which has finished flowering and been pruned back.

It has new shoots on it. Should they be pruned back, or left to die off as winter approaches?

I take it that it is a perennial?

Also, should I put it in the ground or leave it in its pot until Spring?

Any advice greatly recieved. Thanks

• 19 Nov, 2010