Motherwort, Leonurus cardiaca?

Ditto. Remove it.

Mmmm, reminds me of the many labiates which infest my woodland - galeopsis, stachys various mints and the like. I generally ignore them but my herbalist D-i-L always swoops on them...

Thank you everydody! I looked at pictures of motherwort and found that mine must be that! But this weed seems like good herb for heart... so I might keep them.

Meg, I think I'll start using it medicinally too. There's more than enough in the wild around here to use. I love herbalism and ethnobotany.