Physostegia virginiana, commonly known as the obedient plant or false dragonhead, is a herbaceous perennial native to North America. A member of the mint family, it can grow to a height of 3 to 4 feet. The plant features lance-shaped leaves arranged in opposite pairs along the stem and produces spikes of tubular flowers in shades of pink, white, or purple from mid-summer through early fall.
The name "obedient plant" derives from its unique characteristic: when a flower is pushed in any direction, it will stay in that position for a while before gradually returning to its original orientation. This intriguing trait makes it an interesting addition to any garden.
Physostegia virginiana prefers moist soil and partial shade but can tolerate full sun if adequately watered. Its nectar-rich flowers attract bees, butterflies, and hummingbirds, making it a superb choice for pollinator gardens.
The flowers of the obedient plant form a spike-shaped inflorescence. During the flowering season, these blooming spikes sway gracefully in the wind, creating an unforgettable display. FUN FACT · FROM THE LIBRARY
Traditionally, Native Americans used the roots of this plant as a remedy for various ailments such as headaches and stomach problems. However, caution is advised when handling the plant, as some individuals may experience skin irritation from contact with its leaves.
Overall, Physostegia virginiana is an attractive perennial that adds color and interest to gardens while also providing significant benefits for pollinators.
The plant is commonly known as the obedient plant because its flowers can be gently pushed to one side and they will often remain in that position.
The obedient plant is fairly disease-resistant and generally does not suffer from illnesses. However, it can be affected by pests and diseases present in its surroundings. These problems are usually minor. In terms of care, this plant needs moderate maintenance. It should be pruned routinely to preserve a neat appearance and encourage healthy growth. Fertilizing can also help stimulate flowering. The obedient plant is appropriate for anyone with outdoor space, like a garden or patio, and does not demand extensive gardening experience. It may need extra attention if grown indoors.
How to keep Physostegia Virginiana.
Light
The obedient plant prefers locations bathed in abundant sunlight for ideal growth and health. It can, however, cope with moderate sun exposure. Native to sun-flooded habitats, this plant suffers when light is inadequate, producing stunted growth, and when light is excessive, causing leaf scorch.
Water
The obedient plant thrives in moist conditions, preferring consistent hydration but tolerating short periods of dryness. To support its growth, especially during the growing season when evaporation and transpiration rates are higher, it should be watered weekly. Naturally adapted to outdoor environments, the obedient plant benefits from regular moisture to maintain optimal health.
Temperature
Obedient plant is native to areas where temperatures fall between 68 and 95 °F (20 to 35 ℃). It favors warm conditions, but during harsh winters or extreme summers it benefits from environmental adjustments to maintain its preferred temperatures.
Fertilizer
The best time to fertilize an Obedient plant is in early spring, when it is coming out of dormancy and starting active growth. Fertilization supplies essential nutrients for healthy development. Although the Obedient plant has relatively low fertilizer requirements, an annual feeding can improve its survival and encourage better, longer-lasting flowers.
Pruning
The obedient plant is known for its tall, spiky flowers and its ability to withstand stem manipulation. For bushier growth and more blooms, prune the plant from early to late spring. To control its spread and enhance its health, regularly remove any damaged stems and spent flowers. This will help maximize blooming while minimizing stress throughout its growth cycle.
Pot & Repot
When repotting an Obedient plant, select a pot 1-2 inches (2.5–5.1 cm) larger that provides good drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball sits slightly below the pot’s rim. Water thoroughly after repotting and keep the plant in a warm spot with indirect sunlight.
Botanical profile.
- Plant Type
- Herb
- Life Cycle
- Perennial, Annual
- Genus
- Physostegia
- Family
- Lamiaceae
- Hardiness Zone
- 3-10
- Mature Height
- 76 cm
- Mature Spread
- 61 cm to 91 cm
- Leaf Color
- Green
- Leaf Type
- Deciduous
- Flower Color
- Pink, White, Purple, Lavender
- Flower Size
- 2.54 cm to 5.08 cm
- Bloom Time
- Mid summer
- Planting Time
- Spring
- Harvest Time
- Mid summer, Late summer
Other names.
Reader questions.
How should I water my Obedient plant?
To care for the Obedient plant, it is important to use filtered water at room temperature. This is because tap water may contain harmful particles for the plant's health. Additionally, the water should not be too cold as it can shock the plant which prefers warm environments. Avoid watering the plant from above as it can lead to problems with the foliage. Instead, water the plant by applying filtered room temperature water directly to the soil until it is completely soaked. This helps moisten the roots and supports their spread through the soil to collect necessary nutrients.
Why do I have to put fertilizer on my Obedient plant?
Fertilization is beneficial to the Obedient plant for multiple reasons. Primarily, it provides essential nutrients that contribute to the plant's growth both above and below the ground. However, the fertilization requirements for Obedient plants are relatively low. In some cases, they can survive without fertilization. Nonetheless, yearly fertilization can be highly advantageous for Obedient plants. It not only helps maintain the plant's life but also promotes the development of longer-lasting, improved flowers. Therefore, those who wish to enhance the appearance of their Obedient plants should regularly fertilize them.
What are the sunlight requirements for an obedient plant?
The obedient plant, known botanically as Physostegia virginiana, thrives in full sun, requiring above 6 hours of sunlight daily for optimal growth and health. It can also tolerate partial sun, with about 3-6 hours of sunlight. However, the plant's growth can suffer if it receives too little light, leading to stunted growth, or too much direct sunlight, which can cause leaf scorching. It's important to observe how sunlight moves through your garden and choose spots that offer the right balance of light and shade to ensure the plant's happiness.
What is the Obedient plant and where is it indigenous to?
The Obedient plant, known botanically as Physostegia virginiana, is indigenous to regions where temperatures range from 68 to 95 °F (20 to 35 °C). As a heat-loving plant, it thrives in areas that reflect these temperature conditions.
What should I do if I give my Obedient plant too much water or not enough water?
Both overwatering and underwatering can harm the health of your Obedient plant, but overwatering is more common. If the plant gets too much water, the stems and leaves may wilt and turn yellow. Overwatering for a long time can also cause diseases like root rot, mold, and mildew, which can be deadly for the plant. Underwatering is less likely since the Obedient plant can tolerate drought reasonably well. However, it is still possible, and if it happens, the leaves may become brittle and brown. It's crucial to recognize the signs of overwatering early so you can take action. Some diseases resulting from overwatering, like root rot, may be irreversible if not addressed promptly. If you notice early signs of overwatering, reduce watering immediately and check the soil drainage. If the soil doesn't drain well, replace it with a loose, well-draining potting mix. Conversely, if your Obedient plant shows signs of being underwatered, simply increase regular watering until the signs improve.
When should I fertilize my Obedient plant?
The best time to fertilize an Obedient plant is in late winter to early spring when it is transitioning from dormancy to active growth. Fertilizing during this time promotes healthy growth and sets the plant up for a successful season. While spring is generally the most beneficial time to fertilize, it is also okay to fertilize in the fall. However, summer and winter are not recommended times for feeding an Obedient plant.
How can artificial lighting support the growth of obedient plants indoors?
Indoor obedient plants benefit from adequate lighting, especially when natural sunlight is lacking, such as in winter or less sunny locations. Artificial lights, such as LED lights, provide essential support for these plants, offering customized wavelengths suited to their needs. Full sun plants need an intensity of 30-50W/sq ft, partial sun plants require 20-30W/sq ft, and full shade plants need 10-20W/sq ft of artificial light. To mimic natural conditions, the light source should be placed 12-36 inches above the plant and kept on for 8-12 hours per day, depending on the plant species' natural daylight hours.
Does the Obedient plant need protection from cold winters?
Obedient plant has a strong cold resistance, so special frost protection measures are usually not necessary during winter. However, in regions where temperatures are expected to drop below -35°C, some form of cold protection is advised, such as covering the plant with soil or straw. Additionally, before the first freeze in autumn, it's recommended to water the plant abundantly to maintain soil moisture, which helps prevent drought and water scarcity during winter and early spring.
How often do I need to water my Obedient plant?
If your Obedient plant is in a pot, the best way to check if it needs water is by sticking your finger into the soil. If the top two to three inches of soil feel dry, then it's time to give it some water. For Obedient plants grown outdoors in the ground, you can use a similar method to test the soil. If you find that the top few inches of soil have dried out, it's time to water. Typically, during spring and early fall, you'll need to water this plant approximately once a week. However, in extremely hot weather, you may need to water it two or more times a week. It's worth noting that mature, well-established Obedient plants can withstand drought quite well.
When is it not a good idea to fertilize my Obedient plant?
To avoid overfertilization and its complications, it is best to only fertilize your Obedient plant in late winter and early spring. One annual feeding during this time is sufficient. Fertilizing during spring, summer, and fall can easily lead to overfertilization, except if you didn't fertilize in spring, then it is acceptable to feed the plant in fall. Furthermore, there is no need to fertilize during the winter as the Obedient plant is in a dormant phase and does not produce new growth.
What are the symptoms of insufficient or excessive sunlight exposure in obedient plants?
Obedient plants may exhibit various symptoms due to insufficient or excessive sunlight. Insufficient light can lead to smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored or chlorotic leaves. Excessive sunlight, on the other hand, may cause chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms highlight the plant's inability to adapt to either extreme light conditions, affecting its growth, color, and overall health.
How does the Obedient plant react to low temperatures?
The Obedient plant is cold-tolerant and thrives best when temperatures are above 20°C. It should ideally be kept above 0°C during the winter. If temperatures fall below -35°C, there might not be noticeable changes during winter, but there could be a decrease in sprouting or no sprouting at all in spring. The solution for this is to remove any parts in spring that have failed to sprout.
