Siberian Bugloss (Brunnera Macrophylla ‘Langtrees’)

Plant: Table of Contents

Siberian Bugloss (Brunnera macrophylla ‘Langtrees’): A Complete Guide

Plants have an incredible ability to provide aesthetic beauty, improve air quality, and contribute to the overall well-being of our environment. They come in various shapes, colors, and sizes, making them an essential asset to any landscape or garden. In this comprehensive guide, we will delve into the intricate world of the Siberian bugloss (Brunnera macrophylla ‘Langtrees’), a captivating perennial plant that is cherished for its striking foliage and delicate flowers.

What is Siberian Bugloss (Brunnera macrophylla ‘Langtrees’)?

Siberian bugloss, scientifically known as Brunnera macrophylla ‘Langtrees’, belongs to the family Boraginaceae. It is a herbaceous perennial plant native to the woodlands of Eastern Europe and Western Asia. This enchanting plant is revered for its heart-shaped, silver-speckled leaves and dainty, sky-blue flowers that bear a striking resemblance to forget-me-nots. Siberian bugloss is beloved by gardeners and landscapers for its ability to thrive in shady areas, making it an ideal choice for adding color and texture to darker corners of the garden.

Key Takeaways – Siberian Bugloss (Brunnera macrophylla ‘Langtrees’)

Before we delve into the specifics of cultivating Siberian bugloss, let’s highlight the key takeaways about this remarkable plant:

  • Plant Name: Siberian Bugloss (Brunnera macrophylla ‘Langtrees’)
  • Common Names: Langtrees Siberian Bugloss, Langtrees Brunnera
  • Plant Type: Herbaceous Perennial
  • Foliage: Heart-shaped, Silver-speckled Leaves
  • Flowers: Delicate, Sky-blue Flowers
  • Preferred Growing Conditions: Shade or Partial Shade
  • Hardiness Zone: USDA zones 3 to 8


Cultivating Siberian bugloss requires an understanding of its unique cultural needs. Proper care ensures that the plant thrives and displays its characteristic beauty year after year.


Siberian bugloss serves several purposes in a garden or landscape setting. Its unique attributes make it valuable for various applications, including:

  • Ground Cover: The low-growing habit and dense foliage of Siberian bugloss make it an excellent ground cover, particularly in shaded areas where other plants may struggle to thrive.
  • Shade Gardens: Its tolerance for shade makes Siberian bugloss an ideal addition to shaded landscapes or woodland gardens, where it adds color and interest to areas with limited sunlight.
  • Borders and Edges: With its ornamental foliage and delicate flowers, Siberian bugloss can be utilized as an attractive border plant or to edge pathways and garden beds, adding a touch of elegance to the landscape.
  • Containers: Due to its compact growth habit, Siberian bugloss can be cultivated in containers, making it a versatile option for shaded patios, balconies, or urban gardens.


Like many shade-loving plants, Siberian bugloss appreciates consistently moist soil. However, it is important to avoid waterlogged conditions, as excessive moisture can lead to root rot. During hot and dry periods, regular watering is crucial to keep the soil evenly moist. Adding a layer of mulch around the base of the plant can help to retain soil moisture and regulate the temperature of the root zone.


Siberian bugloss is renowned for its ability to thrive in shady conditions, making it an excellent choice for gardens and landscapes with limited sunlight. While it can tolerate some dappled sunlight, the plant generally prefers to be shielded from intense afternoon sun. In hotter regions, providing dappled shade or locating the plant in a north-facing position can help prevent leaf scorch and maintain the plant’s health and vigor.


Maintaining the nutritional needs of Siberian bugloss is fundamental to promoting healthy growth and vibrant foliage. Applying a balanced, slow-release fertilizer in early spring, before the onset of active growth, can provide the necessary nutrients for the plant to flourish. It is important to follow the manufacturer’s instructions for application rates and to avoid over-fertilization, as excessive nutrients can lead to lush growth that is more susceptible to pest and disease issues.


The soil requirements for Siberian bugloss are relatively straightforward. The plant thrives in well-draining, humus-rich soil with a slightly acidic to neutral pH. Amending the soil with organic matter, such as compost or well-rotted leaf mold, can improve its texture and fertility, creating an optimal growing environment for Siberian bugloss. Additionally, ensuring good soil moisture retention is crucial, particularly in regions with warm summers, to support the plant’s overall health and vigor.


Pruning Siberian bugloss is primarily focused on the removal of spent flowers and tattered foliage to maintain its appearance and encourage continuous blooming. After the flowering period, gently removing the faded flower stems can promote additional blossom production and prevent the plant from diverting energy into seed formation. Additionally, in early spring, any damaged or withered foliage can be trimmed back to allow fresh growth to emerge.


Ensuring the perpetuation of Siberian bugloss through propagation methods allows gardeners to expand their plant collection and share the beauty of this remarkable species. The following methods can be employed for propagating Siberian bugloss:

  • Division: Dividing established clumps of Siberian bugloss in early spring is an effective way to propagate the plant. Using a sharp, clean tool, the root ball can be carefully divided into smaller sections, each containing healthy roots and shoots. These divisions can then be replanted in suitable locations, ensuring they receive adequate moisture and protection from direct sunlight during the establishment phase.

  • Seed Propagation: While Siberian bugloss can be grown from seeds, it is important to note that seed propagation may result in variations from the parent plant. Seeds can be collected from mature flower heads and sown in a prepared seedbed, where they should germinate within a few weeks. It is important to provide consistent moisture and protection from extreme temperatures for successful germination and seedling development.

Container Popularity

The versatile nature of Siberian bugloss makes it popular for container cultivation. Its compact size, attractive foliage, and low maintenance requirements render it an excellent choice for adding interest to shaded patios, balconies, and other outdoor spaces. When planting Siberian bugloss in containers, it is essential to ensure that the chosen container provides adequate drainage and that the plant receives the appropriate amount of water and light for its well-being.

Container Common Diseases

While Siberian bugloss is relatively resilient, certain diseases can impact its health and vigor in a container setting. Common diseases that may affect Siberian bugloss in containers include:

  • Root Rot: Prolonged periods of waterlogged soil can lead to root rot, a fungal disease that affects the roots of the plant, causing them to decay and impairing the plant’s ability to absorb moisture and nutrients. To prevent root rot, it is crucial to maintain well-draining soil and avoid overwatering.

  • Powdery Mildew: In humid or poorly ventilated conditions, Siberian bugloss may be susceptible to powdery mildew, a fungal disease that manifests as a white or gray powdery coating on the leaves. Adequate air circulation and avoiding overhead watering can help mitigate the risk of powdery mildew in container-grown plants.

Disease Diagnosis

Correctly identifying and diagnosing diseases affecting Siberian bugloss is fundamental to implementing effective treatment strategies. When observing signs of disease, such as discolored or distorted foliage, wilting, or abnormal growth, it is important to assess the plant’s growing conditions and consider potential stress factors that may be contributing to its decline. Obtaining professional help or submitting a sample to a plant diagnostic clinic can aid in accurately identifying the specific disease affecting the plant and determining the most suitable course of action.

Common Pests

While Siberian bugloss is generally resistant to most pests, certain insects may pose a threat to its well-being. Common pests that may affect Siberian bugloss include:

  • Slugs and Snails: These voracious feeders can cause significant damage to the foliage of Siberian bugloss, particularly in moist, shaded areas. Employing physical barriers, such as copper tape or diatomaceous earth, and regularly checking for and removing these pests can help protect the plant from their destructive feeding habits.

  • Spider Mites: In hot and dry conditions, spider mites can infest Siberian bugloss, causing stippling and discoloration of the leaves. Maintaining adequate humidity and regularly rinsing the foliage with water can help deter spider mites from establishing populations on the plant.

Botanist’s Tips

To ensure the successful cultivation of Siberian bugloss, consider the following botanist’s tips:

  • Selective Planting: When selecting a location for Siberian bugloss, consider areas with consistent shade or dappled sunlight, ensuring that the plant receives adequate protection from intense midday sun.

  • Mulching: Applying a layer of organic mulch around the base of Siberian bugloss can help conserve soil moisture, suppress weed growth, and regulate the temperature of the root zone, promoting overall plant health.

  • Integrated Pest Management: Employing integrated pest management (IPM) strategies, such as regular monitoring, physical barriers, and natural predators, can effectively manage pest populations and minimize the use of chemical interventions.

  • Attractive Companions: Pairing Siberian bugloss with complementary shade-loving plants, such as hostas, ferns, and heucheras, can create visually appealing and harmonious plant combinations in the garden or landscape.

Fun Facts

Delve into the fascinating world of Siberian bugloss with these intriguing fun facts:

  1. The common name “bugloss” is derived from the Greek word “bouglas,” meaning ox tongue, referring to the rough texture and shape of the plant’s leaves.
  2. Siberian bugloss is known for its exceptional cold tolerance, thriving in regions with harsh winters and fluctuating temperatures.
  3. The delicate, sky-blue flowers of Siberian bugloss attract pollinators, including bees and butterflies, contributing to the biodiversity of the garden or landscape.

Links to External Resources

To further expand your knowledge and appreciation of Siberian bugloss (Brunnera macrophylla ‘Langtrees’), explore the following external resources:

  1. The Royal Horticultural Society (RHS) – Growing Brunnera
  2. University of Maryland Extension – Siberian Bugloss
  3. Missouri Botanical Garden – Brunnera Macrophylla
  4. The American Horticultural Society – Langtrees Brunnera
  5. Botanic Gardens Conservation International (BGCI) – Brunnera Macrophylla Conservation

By exploring these resources, you can gain valuable insights and practical tips for successfully cultivating and appreciating Siberian bugloss in your garden or landscape.

In conclusion, Siberian bugloss (Brunnera macrophylla ‘Langtrees’) stands as a captivating perennial plant that embodies beauty, resilience, and versatility. Its striking foliage, delicate flowers, and adaptability to shaded environments make it an exceptional addition to gardens and landscapes. By understanding its cultural requirements and unique attributes, you can cultivate and enjoy the enduring charm of Siberian bugloss, creating enchanting outdoor spaces teeming with life and vitality.

This detailed guide offers extensive information on the Siberian bugloss (Brunnera macrophylla ‘Langtrees’), encompassing its cultural requirements, propagation methods, potential pests and diseases, as well as fascinating fun facts. Additionally, it provides valuable botanist’s tips to aid in the successful cultivation of this captivating perennial plant. For further exploration, the inclusion of links to reputable external resources enables readers to deepen their understanding and appreciation of Siberian bugloss.

Picture of Peter Taylors

Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.