symphytum tuberosum - tuberous comfrey

norfolk forncett mary tuberous comfrey united kingdom england norwich low road clump-forming perennial 60cm tall wide spreading rhizomes coarse hairy deeply-veined dark green leaves stems small clusters pale creamy-yellow pendent flowers borne early summer symphytum tuberosum rhs award garden merit agm helps gardeners plants pollinators plant provide nectar pollen bees pollinating insects included evolving list researched experts divided groups maintained team staff reviewed annually wildflowers world