Most gardeners would think so unless you have a large, rather wild garden. They self seed like mad and have deep tough roots so are best dug up if possible or use weedkiller if not, preferably glyphosate so it travels down to the roots.
There are lots of problems with it in streams and river banks where it loves the moisture. If it isn't in your garden it has blown in from somewhere else. I like it but wouldn't grow it for that reason.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
Thanks everyone, should be fairly easy to knife it out of the patio (famous last words) and will dig up the other clump, yes it’s nice damp clay in front garden so perfect conditions for it but too close to magnolia tree if it’s going to become a bully.
I introduced one to a damp meadow. It is trying to take over. It is controlled, after a fashion, by 2x a year mowing.
Enjoy it, it is rather good looking, but unless you want it to spread, don't let the flowers set seed. If it does start to spead the young plants can be dug out with a sharp knife.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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I introduced one to a damp meadow. It is trying to take over. It is controlled, after a fashion, by 2x a year mowing.
Enjoy it, it is rather good looking, but unless you want it to spread, don't let the flowers set seed. If it does start to spead the young plants can be dug out with a sharp knife.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."