Genus: Obedient plant

Physostegia

Photo/Illustration: 
Jennifer Benner
Obedient plant (Physostegia)
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Lamiaceae
This genus is comprised of a dozen species of erect, deciduous, rhizomatous perennials from moist, sunny sites in eastern North America. Their square stems of often toothed leaves are topped by racemes of 2-lipped flowers that stay in a new position if they are moved on the stalks, giving rise to the name "obedient plant." They are attractive in a border, but some are aggressive growers.
Noteworthy characteristics:  Tubular, 2-lipped flowers in shades of purple, pink, or white. Good cut flowers. Some species are invasive.
Care:  Physostegia prefer fertile, reliably moist soil in part shade or full sun. Some species may need restraint.
Propagation: 

Sow seed in containers in a cold frame in fall, or divide in winter or early spring before new growth begins.

Problems: 

Sometimes bothered by slugs and rust.

Species, varieties and clutivars for genus Physostegia

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Obedient plant
Physostegia virginiana