Wildflower. Established plants are tolerant of considerable neglect, thriving and even self-sowing in dense weed growth.

The plant once had a very high reputation as a healer of wounds.

Succeeds in ordinary garden soil. Prefers a well-drained fertile soil and a sunny position. Tolerates dry, low fertility and alkaline soils.

Sow April in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out into their permanent positions in the summer.

Edible uses:

Flower petals - raw. Added to salads.

http://practicalplants.org/wiki/Centaurea_nigra