Evergreen Candytuft
Iberis sempervirensUSDA | 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, 6 hours min
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 12-18 in tall, 12-24 in wide
- Pets
- Non-toxic to pets and children
Iberis sempervirens, commonly known as Evergreen Candytuft, is a charming perennial native to Europe. Its vibrant white flowers and evergreen foliage make it a favorite for gardens, providing year-round interest and attracting pollinators.
Ask Vesper about Evergreen Candytuft
Ideal temperature
60-75°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 12-18 in tall, 12-24 in wide
- Plant apart
- 12-24 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Iberis sempervirens prefers well-drained soil and should be watered moderately.
Water when the top inch of soil feels dry, typically every 1-2 weeks during the growing season. In hotter months, increase frequency slightly. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and browning leaf edges.
Light
This plant thrives in full sun, requiring at least 6 hours of direct sunlight daily.
Ideal placement includes south-facing gardens or patios. It can tolerate partial shade but may produce fewer flowers in such conditions.
Soil
Iberis sempervirens prefers sandy or loamy soil with good drainage.
The ideal pH range is between 6.0 and 7.0. A recommended potting mix includes a blend of potting soil, sand, and perlite to enhance drainage.
Humidity
This plant prefers moderate humidity levels, around 40-60%.
To increase humidity, mist the leaves or place a humidity tray nearby. Signs of humidity stress include leaf curling and browning tips.
Temperature
Iberis sempervirens thrives in temperatures between 60-75°F (15-24°C) and is hardy in zones 3-9.
It can tolerate light frost but should be protected from extreme heat above 85°F (29°C).
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In fall, reduce feeding as the plant enters dormancy. Signs of nutrient deficiency include stunted growth and pale leaves.
Pruning
Prune after flowering to maintain shape and encourage bushier growth.
Use sharp, clean shears to cut back spent blooms and any dead or damaged stems. Deadheading can promote further blooming throughout the season.
Repotting
Repot every 2-3 years or when the plant 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 or stunted growth. Carefully remove the plant, refresh the soil, and replant.
Propagation
Propagation can be achieved through seeds or division.
For seeds, sow in spring after the last frost, covering lightly with soil. For division, carefully separate established plants in early spring or fall, ensuring each division has roots and foliage. Replant immediately in well-drained soil.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency.
How to fix it
Check soil moisture and reduce watering frequency. Fertilize with a balanced fertilizer if deficiency is suspected.
Root rot
Why it happens
Poor drainage or excessive watering.
How to fix it
Ensure pots have drainage holes and let the soil dry out between waterings. Consider repotting in fresh, well-draining soil.
Wilting
Why it happens
Under-watering or extreme heat.
How to fix it
Water the plant thoroughly and ensure it is in a suitable location with adequate sunlight and airflow.
Browning leaf tips
Why it happens
Low humidity or under-watering.
How to fix it
Increase humidity around the plant and ensure consistent watering practices.
Pest infestations (aphids, spider mites)
Why it happens
Dry conditions or stress.
How to fix it
Regularly inspect the plant and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, prune back any dead foliage and fertilize with a balanced fertilizer to encourage new growth. Water regularly as temperatures rise.
Summer
During summer, monitor soil moisture closely and increase watering frequency if needed. Deadhead spent blooms to promote continued flowering.
Fall
In fall, reduce watering as the plant prepares for dormancy. Consider a light pruning to maintain shape and remove any dead flowers.
Winter
In winter, protect the plant from extreme cold and frost. If grown in pots, consider moving them to a sheltered area to prevent freeze damage.
Toxicity & Safety
Iberis sempervirens is generally considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always monitor pets and children around plants.
Good to know
How often should I water my Evergreen Candytuft?
Water your Evergreen Candytuft when the top inch of soil feels dry, usually every 1-2 weeks. Adjust frequency based on temperature and humidity.
What type of soil is best for Iberis sempervirens?
Iberis sempervirens thrives in sandy or loamy soil with good drainage, ideally with a pH between 6.0 and 7.0. A mix of potting soil, sand, and perlite works well.
Can I grow Evergreen Candytuft in partial shade?
While Iberis sempervirens prefers full sun, it can tolerate partial shade. However, flowering may be reduced in less light.
When should I prune my Evergreen Candytuft?
Prune your Evergreen Candytuft after flowering to maintain shape and encourage bushier growth. Deadheading spent blooms can promote further flowering.
Is Iberis sempervirens toxic to pets?
Iberis sempervirens is generally non-toxic to pets and children, but ingestion of large quantities may cause mild gastrointestinal upset.
What are common pests for Evergreen Candytuft?
Common pests include aphids and spider mites. Regular inspection and treatment with insecticidal soap can help manage these issues.
How do I propagate Iberis sempervirens?
You can propagate Iberis sempervirens through seeds or division. Sow seeds in spring or divide established plants in early spring or fall.
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