Not sure what @Lyn means by cutting all the branches back to 2"... I'd just cut off the dead flowers, like deadheading roses, back to a healthy bud. They don't really need a lot of pruning, though if it gets old and woody you can cut out a third of the oldest stems completely, in mid summer.
Since 2019 I've lived in east Clare, in the west of Ireland.
Thank you all. Thought I would attach a couple of images of how it is this morning. Was late back from work yesterday but will clear the grass today. Is it a globosa? Loads and loads of rain overnight so must be the grass!!
I think it's just had a bit of wind exposure - the more sheltered foliage at the front is much better looking. They flower on the previous year's wood, so you don't hack them back to the ankles each spring like davidiis, you just tidy the flower heads off when done, and take out a few stems now and again when needed. You may find it won't grow so big in the location anyway, but it would benefit it enormously to clear a good space around it. Apart from anything else, it would look much better, but it will prevent grass becoming a problem at the base, especially when you need to cut it - it's easy to damage stems and trunks of shrubs and trees.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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They flower on the previous year's wood, so you don't hack them back to the ankles each spring like davidiis, you just tidy the flower heads off when done, and take out a few stems now and again when needed. You may find it won't grow so big in the location anyway, but it would benefit it enormously to clear a good space around it.
Apart from anything else, it would look much better, but it will prevent grass becoming a problem at the base, especially when you need to cut it - it's easy to damage stems and trunks of shrubs and trees.
I live in west central Scotland - not where that photo is...