It self seeds freely here. All you have to do is pull out the ones that you don't want. Easy from cuttings too if you're somewhere colder where it doesn't set so much seed.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
If you're in a wetter/colder area @Beany1971, and they don't seed so readily, you can take cuttings and grow them on over winter to plant out the following year. They're very amenable, useful plants.
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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https://www.gardenersworld.com/plants/verbena-bonariensis/
They're very amenable, useful plants.
I live in west central Scotland - not where that photo is...