Sweet Mock Orange
Philadelphus coronariusUSDA | Grow Zone
4-8Outdoors all year in zones 4 to 8. Anywhere colder, keep it as a houseplant.
- Light
- Full sun to partial shade
- Water
- Once a week deeply
- Humidity
- 40-60%
- Temperature
- 60-75°F
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 6-10 ft tall
- Pets
- Non-toxic to pets
Sweet Mock Orange, or Philadelphus coronarius, is a fragrant flowering shrub native to Europe. Known for its beautiful white blooms and delightful scent, it is a favorite among gardeners for its easy care and ability to attract pollinators.
Ask Vesper about Sweet Mock Orange
Ideal temperature
60-75°F is where it grows fastest.
Spacing and harvest
- Mature size
- 6-10 ft tall
- Plant apart
- 36-72 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Sweet Mock Orange prefers consistently moist soil, especially during its active growing season in spring and summer.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In the fall and winter, reduce watering to once 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 at least 6 hours of direct sunlight daily.
A location with morning sun and afternoon shade is beneficial in hotter climates. It can tolerate some shade but may produce fewer flowers in low light conditions.
Soil
Sweet Mock Orange prefers well-draining, loamy soil with a pH range of 6.0 to 7.5.
A mix of garden soil, compost, and sand is recommended to improve drainage. Ensure the pot or planting area has good drainage to prevent waterlogging.
Humidity
This plant enjoys moderate humidity levels, around 40-60%.
To increase humidity, consider misting the leaves or placing a humidity tray nearby. Signs of low humidity stress include browning leaf tips and wilting.
Temperature
Sweet Mock Orange thrives in temperatures between 60-75°F (15-24°C) and is hardy in USDA zones 4-8.
It can tolerate cold temperatures down to -20°F (-29°C) but may struggle in extreme heat above 90°F (32°C).
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it every 4-6 weeks during the growing season.
In fall, switch to a low-nitrogen fertilizer to promote root growth. Signs of nutrient deficiency include yellowing leaves, poor growth, and reduced flowering.
Pruning
Prune Sweet Mock Orange in late winter or early spring before new growth begins.
Use sharp, clean pruning shears to remove dead or damaged wood and to shape the plant. Deadheading spent flowers can encourage more blooms and improve overall appearance.
Repotting
Repot Sweet Mock Orange every 2-3 years or when the roots become pot-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. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be done through softwood cuttings in late spring or early summer.
Take 4-6 inch cuttings from healthy stems, remove lower leaves, and dip the cut end in rooting hormone. Plant in a moist potting mix and keep in a warm, humid environment until roots develop, usually within 4-6 weeks.
When it's unhappy
Yellow leaves
Why it happens
Usually caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture and reduce watering if necessary. Fertilize with a balanced fertilizer to address nutrient issues.
Root rot
Why it happens
Excessive moisture and poor drainage.
How to fix it
Ensure proper drainage and reduce watering frequency. If root rot occurs, remove affected roots and repot in fresh soil.
Wilting leaves
Why it happens
Under-watering or sudden temperature changes.
How to fix it
Increase watering frequency and ensure the plant is in a stable environment away from drafts.
Poor flowering
Why it happens
Insufficient sunlight or lack of pruning.
How to fix it
Ensure the plant receives at least 6 hours of sunlight daily and prune after flowering to encourage new growth.
Browning leaf tips
Why it happens
Low humidity or over-fertilization.
How to fix it
Increase humidity levels around the plant and reduce fertilizer application to recommended amounts.
Care through the year
Spring
In spring, focus on watering regularly as the plant begins to grow. Fertilize with a balanced fertilizer to support new growth and flowering.
Summer
During summer, maintain consistent moisture and provide some afternoon shade in hotter climates. Deadhead spent flowers to encourage more blooms.
Fall
In fall, reduce watering as the plant prepares for dormancy. Prune any dead or damaged wood and apply a low-nitrogen fertilizer to promote root growth.
Winter
In winter, protect the plant from extreme cold and ensure it is not over-watered. Water sparingly, allowing the soil to dry out between waterings.
Toxicity & Safety
Sweet Mock Orange is non-toxic to pets and children. However, ingestion of large quantities may cause mild stomach upset. Always monitor children and pets around plants.
Good to know
Why are my Sweet Mock Orange leaves turning yellow?
Yellow leaves on Sweet Mock Orange can indicate over-watering or nutrient deficiency. Check the soil moisture and adjust your watering schedule accordingly.
How often should I water my Sweet Mock Orange?
Water your Sweet Mock Orange deeply once a week during the growing season, allowing the top inch of soil to dry out between waterings.
When is the best time to prune Sweet Mock Orange?
The best time to prune Sweet Mock Orange is in late winter or early spring before new growth begins, which helps shape the plant and encourages more blooms.
What type of soil is best for Sweet Mock Orange?
Sweet Mock Orange prefers well-draining, loamy soil with a pH range of 6.0 to 7.5. A mix of garden soil, compost, and sand is ideal.
How can I increase humidity for my Sweet Mock Orange?
To increase humidity, mist the leaves regularly or place a humidity tray filled with water near the plant. This helps prevent browning leaf tips.
Is Sweet Mock Orange toxic to pets?
No, Sweet Mock Orange is non-toxic to pets and children, making it a safe choice for households with animals.
How can I promote more flowers on my Sweet Mock Orange?
To promote more flowers, ensure your plant receives at least 6 hours of sunlight daily and prune after flowering to encourage new growth.
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