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PlantSnap
Plant Care
Purple false dragonhead
(Physostegia purpurea)
Also Known As
Purple false dragonhead, Obedient plant, False dragonhead, Physostegia
About This Plant
Physostegia purpurea, commonly known as Obedient plant, is a herbaceous perennial plant that belongs to the mint family. It is native to North America and can grow up to 3-4 feet (91-122 cm) tall. The plant has lance-shaped leaves and produces spikes of pink or purple flowers that bloom in late summer.
Plant Care Instructions
Outdoor Size Range
3-4 feet (91-122 cm)
Light Requirements
Obedient plants require full sun to partial shade for optimal growth. They can tolerate shade but may produce fewer flowers.
Humidity Needs
Obedient plants prefer average to high humidity levels. They can benefit from occasional misting or placing a tray of water near the plant to increase humidity.
Fertilizing Schedule
Fertilize the plant with a balanced fertilizer once a month during the growing season (spring and summer).
Pruning Guidelines
Prune obedient plants in early spring to promote bushier growth and remove any dead or damaged stems. Pinch back the tips of the stems in late spring or early summer to encourage branching and more flowers.
Common Pests and Diseases
Obedient plants are relatively pest-free but can be affected by spider mites, aphids, and whiteflies. Treat with insecticidal soap or neem oil if necessary.
Indoor Size Range
12-24 inches (30-61 cm)
Watering Schedule
The soil should be kept consistently moist but not waterlogged. Water the plant deeply once a week, more often during hot and dry weather.
Temperature Range
The plant can tolerate a wide range of temperatures, from -40°F to 100°F (-40°C to 38°C). However, it prefers moderate temperatures between 60°F and 80°F (16°C to 27°C).
Growing Season
The growing season for obedient plants is from late spring to early fall.
Growing Difficulty Level
Physostegia purpurea is relatively easy to grow and maintain, making it a great choice for beginner gardeners.
USDA Hardiness Zones
Physostegia purpurea can grow in USDA hardiness zones 3-9.
Did You Know?
The name 'Obedient plant' comes from the fact that the individual flowers on the spike can be twisted into different positions and will stay in place, as if they are 'obedient' to the gardener's commands.
