Thanks Lyn. Last year I just let them be and in the end they looked a right mess, and didn't get any second flush of flowers so will be interesting to see what happens this year after a good hard trim.
I have a similar one ... the flowers are just going over ... in the past I've always left it and the leaves turn a wonderful red in late summer/autumn. Loathe to cut it back in case that doesn't happen ...
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
I cut, feed and water well. Some flower again but some don't but at least the fresh foliage looks good and helps build a strong root system for next year's flowers.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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No idea why as I can easily get liquid concentrations of comfrey, nettle, fern, horsetail and al sorts for doing different things.