Symphytum officinale - Comfrey
Hardy / perennial / medicinal herb, manure / erratic germination / H. 60 cm/ sun to shade/ well drained soil / blossom colour mauve purple / flowering time 5,6,7
They are easily grown in sun or part shade in moist soil with added manure. In some countries Comfrey is an important animal feed. From the leaves you get a good liquid manure. Propagation from seed is unreliable, best to do by root cuttings or division.