Suggest growing an ornamental nettle to most gardeners and I suspect they'd look at you funny and head off in another direction, but this really is a good one - not stinging, and not at all invasive - just good lush foliage and attractive catkins in late summer.
Thrives best in moistish woodsy conditions but happy anywhere that doesn't dry out too much.
Very like a big lush nettle actually, but don't let that put you off - not at all invasive (or stinging) with pale creamy catkins.
A good summer woodlander for rich moist soils.
1L pots ~ £6