Comfrey

HARDY PERENNIAL. Ht 100cm.

Also known as Knitbone or Blackwort.
This plant is a robust, sometimes invasive, rhizomatous perennial that will grow in most places.
 It has large leaves and produces clusters of bell-shaped, nodding, purple-blue flowers, on erect stems, in spring/summer. The flowers are very attractive to bees and butterflies.
The leaves are used to make a high nitrogen fertilizer and can be added to compost heaps to improve the soil. The plant can also be good for groundcover.
Plant in any fertile soil in part shade or full sun.