Heather
Calluna vulgaris · Scotch Heather · Scottish Heather · LingUSDA | Grow Zone
4-8Outdoors all year in zones 4 to 8. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Full sun, 6-8 hours
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Intermediate
- Growth
- Moderate
- Mature size
- 1-3 ft tall, 1-2 ft wide
Calluna vulgaris, commonly known as Heather, is a resilient and beautiful flowering plant native to Europe. Its vibrant blooms and evergreen foliage make it a popular choice for gardens, providing color and texture throughout the seasons.
Ask Vesper about Heather
Ideal temperature
60-75°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 1-3 ft tall, 1-2 ft wide
- Plant apart
- 12-24 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Calluna vulgaris prefers well-drained soil and should be watered moderately.
Water when the top inch of soil feels dry, typically every 1-2 weeks. In hot summer months, increase frequency but ensure the soil does not remain soggy. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and browning leaf tips.
Light
Heather thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
It can tolerate partial shade but may not flower as profusely. Ideal placement includes south-facing gardens or areas that receive morning sun and afternoon shade in hotter climates.
Soil
The ideal soil for Calluna vulgaris is acidic, with a pH range of 5.0 to 6.0.
It prefers sandy or loamy soil that drains well, as it is susceptible to root rot in heavy, clay soils. A recommended potting mix includes peat moss, perlite, and pine bark to ensure proper drainage.
Humidity
Heather prefers moderate humidity levels, around 40-60%.
To increase humidity, mist the plant or place a humidity tray nearby. Signs of humidity stress include browning leaf tips and stunted growth.
Temperature
Calluna vulgaris thrives in temperatures between 60-75°F (15-24°C) and is hardy in USDA zones 4-8.
It can tolerate cold temperatures but may struggle in extreme heat, so provide some shade during the hottest months.
Fertilizing
Use an acidic fertilizer with an NPK ratio of 10-10-10 or similar, applying it every 4-6 weeks during the growing season (spring and summer).
Reduce or stop fertilizing in fall and winter. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Prune Calluna vulgaris in late winter or early spring before new growth begins.
Use sharp, clean shears to remove dead or damaged stems and to shape the plant. Deadheading spent flowers can encourage more blooms and maintain a tidy appearance.
Repotting
Repot every 2-3 years or when the plant outgrows its container.
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. When repotting, gently remove the plant from its pot, loosen the roots, and place it in fresh, acidic potting mix.
Propagation
Propagation can be achieved through stem cuttings or division.
For stem cuttings, take 4-6 inch cuttings in spring, remove lower leaves, and place them in a moist potting mix. Keep them in a humid environment until roots develop. Division is best done in early spring or fall when the plant is not actively growing.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or poor drainage.
How to fix it
Ensure the soil drains well and reduce watering frequency.
Root rot
Why it happens
Over-watering and heavy soils can lead to root rot.
How to fix it
Improve drainage and allow the soil to dry out between waterings.
Browning leaf tips
Why it happens
This may indicate low humidity or under-watering.
How to fix it
Increase humidity around the plant and ensure consistent watering.
Poor flowering
Why it happens
Insufficient sunlight or nutrient deficiency can lead to fewer blooms.
How to fix it
Ensure the plant receives full sun and consider fertilizing during the growing season.
Pests (e.g., aphids)
Why it happens
Aphids can infest the plant, especially in warm weather.
How to fix it
Use insecticidal soap or neem oil to treat infestations.
Care through the year
Spring
In spring, prune back any dead or damaged stems and apply a balanced, acidic fertilizer to encourage new growth.
Summer
Ensure consistent watering during hot months, and consider mulching to retain moisture and suppress weeds.
Fall
In fall, reduce watering as the plant enters dormancy, and remove any spent flowers to maintain appearance.
Winter
Protect the plant from extreme cold by mulching around the base and avoid over-watering during winter months.
Toxicity & Safety
Calluna vulgaris is non-toxic to pets and children. It is safe to have around, with no known harmful effects from ingestion.
Good to know
How often should I water my Heather plant?
Water your Heather plant when the top inch of soil feels dry, typically every 1-2 weeks, adjusting for seasonal changes.
Why are my Heather leaves turning yellow?
Yellow leaves can indicate over-watering or poor drainage. Ensure the soil drains well and reduce watering frequency.
What type of soil is best for Calluna vulgaris?
Heather prefers acidic, well-drained soil with a pH of 5.0 to 6.0. A mix of peat moss, perlite, and pine bark works well.
Can I grow Heather in partial shade?
While Heather can tolerate partial shade, it thrives best in full sun, requiring at least 6-8 hours of direct sunlight daily for optimal growth.
When should I prune my Heather plant?
Prune your Heather in late winter or early spring before new growth begins to maintain shape and encourage blooming.
Is Heather toxic to pets?
No, Calluna vulgaris is non-toxic to both pets and children, making it a safe choice for gardens.
How do I propagate Heather?
You can propagate Heather through stem cuttings or division, with cuttings taken in spring and division done in early spring or fall.
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