#83 Physostegia virginiana Common Names: obedient plant, false dragonhead Family: Lamiaceae/Labiatae (mint Family) Get link to this Profile or click for data record #83

The dramatic lavender-pink flower spikes of obedient plant appear in late summer.

Location
Obedient plant is native to eastern North America from Quebec to Manitoba, and south to Texas, Louisiana, Alabama and Georgia. Obedient plant occurs in swamps, streambanks, ditches, seepages, damp meadows and prairies, moist open woodlands, bogs, and pine savannas.

Culture
Lightly acid sandy loam is probably the best soil type for Physostegia virginiana, but it will grow on a variety of moist soils. Anywhere in the pH 5-7 range is fine. Fertilize often during the growing season and mulch well in the fall in cold climates. Divide every 2-3 years in the spring.
Light: Obedient plant is happy in either sunny or lightly shaded spots, but it does best with some shade on drier sites, and full sun where it is wetter.
Moisture: Physostegia likes moist soil. Low spots and wetland edges that flood occasionally are fine. It will even be happy in soil that is saturated much of the time, but it will be less invasive and have sturdier stems under drier conditions.
Hardiness: USDA Zones 3 - 9.
Propagation: Obedient plant can be sown outdoors in spring or summer (up to two months before the first frost) or indoors anytime. For best germination rates, sow in the fall as soon as the seeds are ripe. Sow them where they are to grow or leave the flats outdoors for three months of damp stratification at about 40ºF (4.4ºC). Seedlings will appear a few weeks after spring temperatures rise into the 70ºF (21ºC) range. Indoors, use a rich loamy soil mix and keep it moist and around 70-75 F (21-24ºC). Germination will occur in 1-4 weeks. Seedlings will flower their second year. You can produce blooming plants faster by taking 2-3 in (5.1-7.6 cm) cuttings of young shoots in the spring and rooting them in a coldframe. It is safest to divide Physostegia in the spring. In mild climates you can divide them in the early fall, then protect the new plants with mulch. Replant only the vigorous outer roots.

Several varieties of obedient plant that have white flowers are available.

Features
This is a wonderful plant to add luminous rosy lavender late season color to the bronzy golds and yellows of a damp meadow. It holds its own with grasses very well. And it is classified as deer resistant, so it should bloom well in places where deer would eat the tasty buds off other flowers.

WARNING
Obedient plant can be an aggressive colonizer, especially on rich moist sites. To keep it a genuinely obedient plant, pick a place with drier soil and cut down on the fertilizer.

Linda Conway Duever 9/24/00; updated 4/2/04

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