Common Ninebark
Physocarpus opulifoliusUSDA | Grow Zone
3-7Outdoors all year in zones 3 to 7. Anywhere colder, keep it as a houseplant. Protect it below 0°F.
- Light
- Full sun to partial shade
- Water
- Weekly, allow top inch dry
- Humidity
- Moderate humidity preferred
- Temperature
- 20-75°F (-6 to 24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 6-10 ft tall, 4-6 ft wide
Common Ninebark (Physocarpus opulifolius) is a versatile shrub known for its attractive foliage and unique peeling bark. Native to North America, it thrives in various conditions, making it a popular choice for gardens and landscapes.
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Ideal temperature
20-75°F is where it grows fastest. Below 0°F cold damage starts.
Spacing and harvest
- Mature size
- 6-10 ft tall, 4-6 ft wide
- Plant apart
- 48-72 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Common Ninebark prefers consistently moist soil, especially during its growing season in spring and summer.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In fall and winter, reduce watering to every two weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in full sun to partial shade, ideally receiving 6-8 hours of sunlight daily.
It can tolerate some shade but may not flower as profusely. For best results, place it in a location that receives morning sun and afternoon shade, especially in hotter climates.
Soil
Physocarpus opulifolius prefers well-draining, loamy soil with a pH range of 6.0 to 7.5.
A mix of garden soil, compost, and sand works well to ensure good drainage. Avoid heavy clay soils that retain too much moisture, which can lead to root issues.
Humidity
Common Ninebark is adaptable to various humidity levels but prefers moderate humidity.
To increase humidity, consider misting the leaves or placing a humidifier nearby. Signs of humidity stress include browning leaf edges and leaf drop.
Temperature
The ideal temperature range for Common Ninebark is 20-75°F (-6 to 24°C).
It is hardy in USDA zones 3-7, tolerating cold winters and hot summers. Protect from extreme heat and frost during late spring.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it in early spring as new growth begins.
Fertilize every 4-6 weeks during the growing season, tapering off in late summer. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Common Ninebark in late winter or early spring before new growth appears.
Use sharp, clean pruning shears to remove dead or damaged branches and to shape the plant. Deadheading spent flowers can encourage more blooms throughout the season.
Repotting
Repot Common Ninebark every 2-3 years or when it outgrows its container.
Signs it needs repotting include roots growing out of the drainage holes or stunted growth. Choose a pot that is 1-2 inches larger in diameter, and gently loosen the roots before placing it in fresh potting mix.
Propagation
Common Ninebark can be propagated through stem cuttings or division.
For stem cuttings, take 4-6 inch cuttings in late spring, dip them in rooting hormone, and plant in a moist potting mix. Keep them in a warm, humid environment until roots develop. Division can be done in early spring when the plant is actively growing.
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 level and adjust watering accordingly. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Root rot
Why it happens
Root rot is typically caused by overly wet soil conditions.
How to fix it
Ensure proper drainage and reduce watering frequency. If root rot is severe, consider repotting the plant in fresh, dry soil.
Leaf drop
Why it happens
Leaf drop can occur due to stress from temperature changes or inadequate watering.
How to fix it
Maintain consistent watering and protect the plant from extreme temperature fluctuations.
Powdery mildew
Why it happens
This fungal disease thrives in humid conditions with poor air circulation.
How to fix it
Improve air circulation around the plant and apply fungicides if necessary.
Pests (aphids, spider mites)
Why it happens
Pests can infest the plant, especially during warm weather.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, prune any dead or damaged branches and begin a regular watering and fertilizing schedule as new growth appears.
Summer
During summer, ensure the plant receives adequate water, especially in hot weather, and monitor for pests.
Fall
In fall, reduce watering frequency and prepare for winter by mulching around the base to protect roots from freezing temperatures.
Winter
In winter, limit watering to every two weeks and protect the plant from extreme cold and frost.
Toxicity & Safety
Common Ninebark is non-toxic to pets and children. It is safe to grow around cats and dogs, with no known harmful effects from ingestion.
Good to know
How often should I water my Common Ninebark?
Water your Common Ninebark once a week during the growing season, allowing the top inch of soil to dry out between waterings. In fall and winter, reduce watering to every two weeks.
What type of soil does Common Ninebark prefer?
Common Ninebark thrives in well-draining, loamy soil with a pH range of 6.0 to 7.5. A mix of garden soil, compost, and sand is ideal for good drainage.
When is the best time to prune Common Ninebark?
The best time to prune Common Ninebark is in late winter or early spring before new growth appears. This helps maintain its shape and encourages new blooms.
How can I propagate Common Ninebark?
You can propagate Common Ninebark through stem cuttings or division. Stem cuttings should be taken in late spring, while division can be done in early spring.
What are the signs of nutrient deficiency in Common Ninebark?
Signs of nutrient deficiency include yellowing leaves and stunted growth. Regular fertilization during the growing season can help prevent these issues.
Is Common Ninebark toxic to pets?
Common Ninebark is non-toxic to pets and children, making it a safe choice for gardens where animals play.
What should I do if my Common Ninebark has yellow leaves?
If your Common Ninebark has yellow leaves, check for over-watering or nutrient deficiency. Adjust watering practices and consider fertilizing if needed.
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