Canada Goldenrod (Solidago canadensis) is a glorious perennial wildflower. Much loved by insects and pollinators, it spreads rhizomatously to form dense stands. And it has a wide variety of medicinal uses.
These Goldenrods are sold as dormant 2nd year root-crowns with a bit of stalk attached.
Photo credit: U.S. Fish and Wildlife Service - Midwest Region, Public domain, via Wikimedia Commons