This well-known genus is easily grown in any garden soil by simply sowing the seeds, one-eighth of an inch deep, in the open ground, in March, where wanted to bloom, and thinning the plants to six inches apart; after thinning, mulch the ground about the plants with half an inch of old manure and give a good watering.

Centaurea ragusina, the woolly-leaved species, is better treated by sowing the seeds in a gentle heat, in February, and, when large enough to be handled, pricking them off three inches apart in boxes. Harden them off gradually and plant them in the open ground early in May. This species also may be propagated by cuttings in September or October.