Obedient Plant
Physostegia virginianaUSDA | Grow Zone
3-9Outdoors all year in zones 3 to 9. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Full sun to partial shade
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 65-75°F (18-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 2-4 ft tall, 1-2 ft wide
- Pets
- Non-toxic to pets and children
The Obedient Plant, known scientifically as Physostegia virginiana, is a perennial favorite for its unique ability to hold its flowers in place when gently pushed. Native to North America, it thrives in sunny gardens and attracts pollinators, making it a wonderful addition to any landscape.
Ask Vesper about Obedient Plant
Ideal temperature
65-75°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 2-4 ft tall, 1-2 ft wide
- Plant apart
- 12-24 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
The Obedient Plant prefers consistently moist soil, especially during its active growing season in spring and summer.
Water thoroughly when the top inch of soil feels dry, typically every 1-2 weeks. In the fall and winter, reduce watering to every 2-3 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering can cause wilting and browning leaf edges.
Light
This plant thrives in full sun to partial shade, ideally receiving at least 6 hours of direct sunlight daily.
It can tolerate some shade, particularly in hotter climates, but too much shade may lead to leggy growth. A spot with morning sun and afternoon shade is often ideal.
Soil
Obedient Plants prefer well-draining soil that is rich in organic matter.
A pH range of 6.0 to 7.0 is optimal. A good potting mix can include equal parts of peat moss, compost, and perlite to ensure proper drainage while retaining moisture.
Humidity
Humidity levels of 40-60% are ideal for the Obedient Plant.
To increase humidity, consider misting the leaves or placing a humidifier nearby. Signs of low humidity include browning leaf tips and edges, while excessive humidity can lead to fungal issues.
Temperature
The ideal temperature range for the Obedient Plant is between 65-75°F (18-24°C).
It is hardy in USDA zones 3-9, tolerating cold temperatures but may struggle in extreme heat. During summer, ensure adequate water to prevent heat stress.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
Reduce feeding in the fall and winter. Signs of nutrient deficiency include yellowing leaves, stunted growth, and poor flowering.
Pruning
Prune the Obedient Plant in late winter or early spring to remove dead or damaged stems and to shape the plant.
Use clean, sharp pruning shears to make cuts just above a leaf node. Deadheading spent flowers can encourage more blooms throughout the season.
Repotting
Repot the Obedient Plant every 2-3 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. To repot, gently remove the plant from its current pot, loosen the roots, and place it in fresh potting mix.
Propagation
Obedient Plants can be propagated through division or seeds.
For division, carefully dig up the plant in early spring or fall, separating the roots into sections with at least one growth bud each. Replant immediately. For seed propagation, sow seeds indoors 6-8 weeks before the last frost, or directly outdoors after the last frost, ensuring they are lightly covered with soil.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check the soil moisture and adjust watering accordingly. Fertilize if nutrient deficiency is suspected.
Root rot
Why it happens
Over-watering or poorly draining soil can lead to root rot.
How to fix it
Ensure proper drainage and reduce watering frequency. If root rot is present, remove affected roots and repot in fresh soil.
Leggy growth
Why it happens
Insufficient light can cause the plant to stretch towards the light source.
How to fix it
Move the plant to a brighter location to encourage bushier growth.
Powdery mildew
Why it happens
High humidity and poor air circulation can lead to powdery mildew.
How to fix it
Improve air circulation around the plant and avoid overhead watering. Treat with fungicide if necessary.
Wilting
Why it happens
Under-watering or extreme heat can cause wilting.
How to fix it
Check soil moisture and water thoroughly if dry. Provide shade during extreme heat.
Care through the year
Spring
In spring, focus on watering regularly as the plant begins to actively grow. Fertilize with a balanced fertilizer to promote healthy growth and flowering.
Summer
During summer, ensure the plant receives adequate water, especially in hot weather. Deadhead spent flowers to encourage continuous blooming.
Fall
In fall, reduce watering as the plant prepares for dormancy. Consider dividing the plant if it has become too large or crowded.
Winter
In winter, minimize watering to every 2-3 weeks and keep the plant in a cool location. Avoid fertilizing during this dormant period.
Toxicity & Safety
The Obedient Plant is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always monitor children and pets around plants.
Good to know
Why are my Obedient Plant leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check the soil moisture and adjust your watering schedule accordingly.
How often should I water my Obedient Plant?
Water your Obedient Plant every 1-2 weeks during the growing season, allowing the top inch of soil to dry out between waterings.
What type of soil is best for Obedient Plants?
Obedient Plants thrive in well-draining soil rich in organic matter, with a pH range of 6.0 to 7.0. A mix of peat moss, compost, and perlite works well.
How do I propagate my Obedient Plant?
You can propagate Obedient Plants through division or seeds. Division is best done in early spring or fall, while seeds can be sown indoors or outdoors after the last frost.
When should I prune my Obedient Plant?
Prune your Obedient Plant in late winter or early spring to remove dead stems and shape the plant. Deadheading spent flowers can also encourage more blooms.
What are the ideal light conditions for Obedient Plants?
Obedient Plants prefer full sun to partial shade, ideally receiving at least 6 hours of direct sunlight daily for optimal growth and flowering.
Is the Obedient Plant toxic to pets?
No, the Obedient Plant is non-toxic to both pets and children, making it a safe addition to your garden or home.
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