rue 'Elin'

'Elin' is a vigorous, erect, clump-forming, rhizomatous herbaceous perennial up to 2.5m high, with deep purple stems, three-ternate or four-ternate leaves, up to 45cm long, of rounded, three-lobed or five-lobed blue-green leaflets, and panicles of flowers, 1cm across, of pale lilac sepals and long, cream-yellow stamens, in summer; honeybees visit Thalictrum flowers for pollen