I believe they're native to the UK, but not the US. The plant was also rated in second place for per day nectar production per flower in a UK plants survey cond

I believe they're native to the UK, but not the US. The plant was also rated in second place for per day nectar production per flower in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative. They also look wonderful, so they're very much here to stay.