Set plants for use as a hedge or for massed effect 2 feet apart. (Dwarf varieties should be spaced closer together for quick ground coverage.) Choose a location in full sun or light shade, remembering that more sun encourages a more vigorous blooming season. A rich, well-drained soil will suit them very well.
Water well during periods of drought. We recommend, in addition, a summer mulch to help conserve moisture. An application of balanced fertilizer is a good idea. Shrubby types should be pruned to remove dead wood after spring growth commences; perennials may be divided as needed. Otherwise, no special care is required.