Bugle
Ajuga reptansUSDA | Grow Zone
3-9Outdoors all year in zones 3 to 9. Anywhere colder, keep it as a houseplant.
- Light
- Partial shade to full sun
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 6-12 in tall, 12-24 in wide
Ajuga reptans, commonly known as Bugle, is a versatile ground cover native to Europe. It is prized for its vibrant foliage and beautiful blue flowers, making it a popular choice for gardens and landscapes.
Ask Vesper about Bugle
Ideal temperature
60-75°F is where it grows fastest.
Spacing and harvest
- Mature size
- 6-12 in tall, 12-24 in wide
- Plant apart
- 12-24 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Ajuga reptans prefers consistently moist soil, especially during its active growing season in spring and summer.
Water when the top inch of soil feels dry, typically every 1-2 weeks, adjusting frequency based on rainfall and temperature. 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 partial shade but can tolerate full sun, especially in cooler climates.
Ideally, it should receive 4-6 hours of indirect sunlight daily. In hotter regions, some afternoon shade is beneficial to prevent leaf scorch.
Soil
Ajuga prefers well-draining soil rich in organic matter, with a pH range of 6.0 to 7.0.
A potting mix that includes peat moss, compost, and perlite is recommended to ensure proper drainage and nutrient availability.
Humidity
While Ajuga reptans is not particularly fussy about humidity, it thrives in moderate humidity levels of 40-60%.
To increase humidity, consider misting the leaves or placing a humidity tray nearby. Signs of low humidity include browning leaf tips and edges.
Temperature
The ideal temperature range for Ajuga is between 60-75°F (15-24°C).
It is hardy in USDA zones 3-9, tolerating cold down to -30°F (-34°C) and heat up to 90°F (32°C). During extreme heat, provide some shade to avoid stress.
Fertilizing
Use a balanced, slow-release fertilizer with an NPK ratio of 10-10-10 during the growing season, applying it every 4-6 weeks.
Signs of nutrient deficiency include stunted growth and pale leaves, indicating a need for additional feeding.
Pruning
Prune Ajuga in early spring to remove any dead or damaged foliage and to encourage new growth.
Use clean, sharp scissors or pruning shears for best results. Deadheading spent flowers can promote a tidier appearance but is not necessary for plant health.
Repotting
Repot Ajuga every 2-3 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter than the current one. Signs that it needs repotting include roots growing out of the drainage holes and stunted growth. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Ajuga can be propagated through division or seeds.
For division, carefully dig up the plant in early spring or fall, separating the root clumps into smaller sections, and replant them immediately. For seed propagation, collect seeds in late summer, sow them in a seed tray, and keep them moist until germination occurs, which typically takes 2-4 weeks.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency.
How to fix it
Ensure proper drainage and reduce watering frequency. Consider fertilizing if nutrient deficiency is suspected.
Root rot
Why it happens
Excess moisture in the soil.
How to fix it
Allow the soil to dry out before watering again, and consider repotting in fresh, dry soil.
Wilting leaves
Why it happens
Under-watering or extreme heat.
How to fix it
Increase watering frequency and provide shade during the hottest part of the day.
Browning leaf edges
Why it happens
Low humidity or inconsistent watering.
How to fix it
Increase humidity levels and maintain a consistent watering schedule.
Pest infestations (aphids, spider mites)
Why it happens
Dry conditions or overcrowding.
How to fix it
Inspect plants regularly, and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, focus on pruning any dead leaves and fertilizing to promote new growth. Ensure adequate moisture as the plant begins to actively grow.
Summer
During summer, monitor moisture levels closely, especially in full sun. Mulching can help retain soil moisture and keep roots cool.
Fall
In fall, reduce watering as the plant prepares for dormancy. Consider dividing the plant if it has become too large.
Winter
In winter, protect Ajuga from extreme cold by covering it with mulch. Avoid over-watering, as the plant will require less moisture during dormancy.
Toxicity & Safety
Ajuga reptans is non-toxic to pets and children. It is safe to have around cats and dogs, with no known adverse effects from ingestion.
Good to know
Why are my Ajuga leaves turning yellow?
Yellow leaves on Ajuga can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if needed.
How often should I water my Ajuga?
Water your Ajuga when the top inch of soil feels dry, typically every 1-2 weeks, adjusting based on weather conditions.
Can Ajuga grow in full sun?
Yes, Ajuga can tolerate full sun, especially in cooler climates, but it thrives best in partial shade to prevent leaf scorch.
How do I propagate Ajuga?
Ajuga can be propagated through division or seeds. Division is best done in spring or fall, while seeds can be sown in a seed tray.
What type of soil is best for Ajuga?
Ajuga prefers well-draining soil rich in organic matter, with a pH range of 6.0 to 7.0 for optimal growth.
Is Ajuga toxic to pets?
No, Ajuga reptans is non-toxic to both pets and children, making it a safe choice for homes with animals.
When should I prune my Ajuga?
Prune Ajuga in early spring to remove dead foliage and encourage new growth, using clean, sharp scissors.
Track this plant in your garden.
Set care reminders, log growth, and join a community of plant lovers.