Agastache foeniculum, or anise hyssop. I have a few growing in a bed with globe thistle and sea lavender. The combination was quite by accident but really looks nice together. Yours looks beautiful with the pink snaps. It's an edible herb - apparently good for tea but I haven't tried it.

Thanks Pudge! I really do like it except for the fact it seems to self seed a lot but then what are a few more weeds :-)

I have this one in my garden. It does tend to be 'invasive' but I find the seedllings easy to pull out. I let it stay because it smells great after a rain and it attracts beneficials to your garden. Being an herb, you can also make tea from the dried leaves. It spreads easily because it is part of the mint family. I read somewhere that any plant with a square stem is related to mints. Marg

Thanks Marric, I didn't know that about the square stems and mint. Now I'll be forever looking at the stems of everything, lol.