Thirty species of aromatic perennials make up this genus. They are known for their long-lasting flower spikes and ability to tolerate heat and early frosts. Hummingbirds, bees, butterflies, and other insects love them. Some are native to the United States.
Noteworthy CharacteristicsLong bloom time; aromatic foliage; beautiful flower spikes. Many cultivars are available.
CareThese plants like well-drained, fertile soil in full sun. They may be grown as annuals and in containers where not hardy.
PropagationDivide in spring. Sow seed at 55° to 64°F in early spring. Root semi-ripe cuttings in summer.
ProblemsGenerally trouble free, but mildew and rust may affect leaves in dry weather. Downy mildew and other fungal leaf diseases are less common.