It's a lovely potted plant, at least!

I dug this Mystery Plant up in the herb bed, as the garden spot was being prepared for the location of our new Chicken Coop / Hen House.

Wormwood?

Close up of the above

I put the Mystery Plant in the chicken run, and, they wouldn't touch it.
I soon decided the plant  was unappealing at best and toxic at worst!

I sent photos of the Mystery Plant to a herbalist, who identified it as Wormwood, as I suspected. Smart chickens...wormwood should only be used dried!