Largeleaf Brunnera
Brunnera macrophylla · False Forget-me-not · Siberian BuglossUSDA | Grow Zone
3-8Outdoors all year in zones 3 to 8. Anywhere colder, keep it as a houseplant. Protect it below 20°F.
- Light
- Partial shade
- Water
- Once a week
- Humidity
- 40-60%
- Temperature
- 60-75°F
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 12-24 in tall
Brunnera macrophylla, commonly known as Largeleaf Brunnera or False Forget-me-not, is a stunning perennial native to Siberia. Its striking blue flowers and large leaves make it a popular choice for shaded gardens, providing vibrant color and texture.
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Ideal temperature
60-75°F is where it grows fastest. Below 20°F cold damage starts.
Spacing and harvest
- Mature size
- 12-24 in tall
- Plant apart
- 18-24 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Brunnera macrophylla prefers consistently moist soil, so water regularly, about once a week, ensuring the top inch of soil remains damp.
During hot summer months, you may need to increase watering frequency. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf curl.
Light
This plant thrives in partial shade, ideally receiving 4-6 hours of filtered sunlight daily.
While it can tolerate full shade, too much direct sunlight can scorch the leaves. Ideal placements include areas under trees or near structures that provide dappled light.
Soil
Brunnera macrophylla prefers well-draining, rich, loamy soil with a pH range of 6.0 to 7.0.
Incorporating organic matter, such as compost, will enhance soil fertility and drainage. A recommended potting mix would be a blend of peat, perlite, and garden soil.
Humidity
This plant enjoys moderate humidity levels, ideally between 40-60%.
To increase humidity, mist the leaves or place a humidity tray filled with water nearby. Signs of humidity stress include browning leaf edges and wilting.
Temperature
Brunnera macrophylla thrives in temperatures between 60-75°F (15-24°C) and is hardy in USDA zones 3-8.
It can tolerate cold temperatures down to 20°F (-6°C) but may struggle in extreme heat, so provide some shade during hotter months.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it every 4-6 weeks during the growing season.
Reduce feeding in fall and winter. Signs of nutrient deficiency include stunted growth and pale leaves.
Pruning
Prune back dead or damaged leaves in early spring to encourage new growth.
Use clean, sharp scissors or pruning shears. Deadheading is not necessary, but removing spent flower stalks can improve appearance.
Repotting
Repot Brunnera macrophylla every 2-3 years or when roots become crowded.
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. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh soil.
Propagation
Propagation can be achieved through division or seeds.
For division, carefully dig up the plant in early spring or fall, and separate the root clumps. Replant immediately. If using seeds, sow them in a cold frame in late winter or early spring, covering lightly with soil.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or poor drainage.
How to fix it
Ensure the soil drains well and reduce watering frequency.
Wilting leaves
Why it happens
Typically a sign of under-watering or excessive heat.
How to fix it
Increase watering and provide shade during hot weather.
Leaf spots
Why it happens
Can be due to fungal infections or water splashing on leaves.
How to fix it
Improve air circulation and avoid overhead watering.
Stunted growth
Why it happens
Often related to nutrient deficiency or root crowding.
How to fix it
Fertilize appropriately and consider repotting if roots are crowded.
Brown leaf edges
Why it happens
Usually indicates low humidity levels.
How to fix it
Increase humidity through misting or using a humidity tray.
Care through the year
Spring
In spring, prune back any dead foliage and apply a balanced fertilizer to encourage new growth. Ensure consistent watering as temperatures rise.
Summer
During summer, monitor soil moisture closely and provide shade during extreme heat. Keep the area around the plant free of weeds.
Fall
In fall, reduce watering as the plant enters dormancy. You may also divide the plant if needed, and apply mulch to protect roots during winter.
Winter
In winter, protect the plant from harsh frost by applying a layer of mulch. Water sparingly, ensuring the soil does not completely dry out.
Toxicity & Safety
Brunnera macrophylla is non-toxic to pets and children, making it a safe choice for gardens. No parts of the plant are known to cause harm if ingested.
Good to know
How often should I water my Brunnera macrophylla?
Water Brunnera macrophylla once a week, ensuring the soil remains consistently moist but not soggy. Adjust frequency during hotter months.
What type of soil is best for Brunnera macrophylla?
This plant thrives in well-draining, rich loamy soil with a pH of 6.0 to 7.0. Adding organic matter like compost will enhance growth.
Can Brunnera macrophylla grow in full shade?
Yes, Brunnera macrophylla can tolerate full shade, but it performs best in partial shade with some filtered sunlight for optimal growth.
Why are my Brunnera macrophylla leaves turning yellow?
Yellow leaves can indicate over-watering or poor drainage. Ensure the soil drains well and adjust your watering schedule accordingly.
How do I propagate Brunnera macrophylla?
You can propagate Brunnera macrophylla through division in spring or fall, or by sowing seeds in a cold frame in late winter or early spring.
What pests affect Brunnera macrophylla?
Common pests include slugs and snails. To manage them, use organic deterrents or traps, and ensure good air circulation around the plants.
When should I prune my Brunnera macrophylla?
Prune back any dead or damaged leaves in early spring to promote healthy new growth. Use clean, sharp tools for best results.
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