Stachys byzantium crowding the Heucheras

Stachys is athug but a very amenable and likeable one, would be lovely paired with one of the really dark heucheras like obsidian or choral bells.

I have one heuchera and one heucherella left after the move. Had a number in my last garden which I left with my cousin in payment for help with storage of my other plants over winter. I love the silveriness of the stachys and it looks good along with artemisia ludoviciana and A. lactiflora ghizhou in a moonlight garden. I really must get some artemisias... another plant left behind.