Posted: 20/07/2014 at 07:14
Phlomis is tough as old boots and will stay evergreen in winter unless you get prolonged heavy frosts or snow. You can safely pull it up or cut it back now. I have a huge clump of this which is half the size of what it was at the start of the year because you can have too much of a good thing. It spreads by wandering roots and seeds and is very happy here in central Belgium where winters can be severe.
Similarly, my echinops are a bit too happy and self seed with gay abandon so just dig up or pull up what you don't want. You may need to provide support for the remaining plants as it tends to flop after rain or a bit of wind.
I loathe euphorbia - unattractive forms and colours and nasty sap IMHO - so can't help with those.
Leave the seed heads on the plants you do keep as they provide food for the birds and the phlomis look particularly attractive when frosted in winter.