Boehmeria

Boehmeria is a genus of remarkably ornamental non-stinging nettles, mostly from Eastern Asia. 

Mostly they're grown for the lush foliage and vigorous (but not invasive) growth habit, but the catkin-like flowers are also attractive. All prefer a moist rich soil in sun or semi shade, but they are adaptable.

Boehmeria sieboldiana

Shiny fresh green attractively veined and serrated nettle leaves on a lush bushy plant to over 6ft tall. Whitish flowers. 

Moist woodland ideally but adaptable
£8

Boehmeria tricuspis

A shorter species with, as the name suggests, three-cusped leaves. 

Lush translucent green leaves on reddish stems with pinkish flowers

£8