Growing these for the first time and they have been beautiful but some flowers now dying, these I cut off. After flowering do I cut them back and how far? Thanks
Depending on variety, many will have a second smaller flush of flowers if you cut them back after the first flush. Others will only have a few in the second flush and some will carry on flowering prolifically, but they tend do be the newer highly bred varieties. That's my experience.
Based in Sussex, I garden to encourage as many birds to my garden as possible.
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When you deadhead, you should get more flower stems appearing off and on through summer.
I live in west central Scotland - not where that photo is...