This well-known Summer-flowering plant is a general favorite on account of its pretty blue flowers and long-continued season of profuse blooming. A good light loam well-enriched with old manure will grow it well. Plant the dwarf varieties six inches apart, and the tall species about fifteen inches apart.

Propagate by cuttings in September, in a cold frame or greenhouse; in Winter protect them from frosts; plant them out of doors as soon as the danger from cold weather is over.