Bigleaf Maple (Acer Macrophyllum)

Plant: Table of Contents

Bigleaf Maple (Acer macrophyllum): A Comprehensive Guide

Bigleaf maple, scientifically known as Acer macrophyllum, is a majestic deciduous tree native to the Pacific Northwest of North America. It is an iconic species that holds ecological, cultural, and economic significance in the region. In this comprehensive guide, we will delve into every aspect of this remarkable tree, from its botanical characteristics to its cultural and ecological importance.

What is Bigleaf Maple (Acer macrophyllum)?

Bigleaf maple, also referred to as Pacific maple or Western maple, is a species of maple tree known for its impressive size, large leaves, distinctive bark, and valuable wood. This deciduous tree belongs to the Aceraceae family and is recognized for its broad ecological adaptation and cultural value. Its botanical features, habitat, and uses make it a fascinating subject for plant enthusiasts, researchers, and conservationists.

Identification and Characteristics

Acer macrophyllum can be identified by:

  • Large Leaves: As the name suggests, the bigleaf maple is characterized by its notably large leaves, which can measure up to 12 inches in width and 10 inches in length. These leaves have a striking palmate veination and a vibrant green color.

  • Distinctive Bark: The bark of the bigleaf maple is often dark and exhibits deep furrows as the tree matures, adding to its aesthetic appeal and making it easily recognizable.

  • Size and Form: This maple species is typically a large tree, often reaching heights of 50 to 100 feet tall with a wide, rounded crown, making it a prominent feature in the forests where it thrives.

  • Shade Tolerance: Bigleaf maple demonstrates a high level of shade tolerance, allowing it to thrive in the understory of forests as well as in more open environments.

Key Takeaways

Before we delve deeper into the various aspects of bigleaf maple, let’s highlight some key takeaways regarding this remarkable tree:

  • Botanical Name: Acer macrophyllum
  • Common Names: Bigleaf Maple, Pacific Maple, Western Maple, Large-leafed Maple
  • Ecological Significance: Native to the Pacific Northwest, bigleaf maple is an important component of the region’s forest ecosystems, providing habitat and contributing to biodiversity.
  • Cultural and Traditional Uses: The tree has a rich history of traditional uses, with its wood being employed in woodworking and its sap used for producing maple syrup.
  • Conservation Status: While it is not currently listed as endangered, conservation efforts are important to preserve the ecological and cultural significance of bigleaf maple.
  • Growth and Cultivation: Understanding the ideal growing conditions is crucial for successful cultivation, making it a desirable addition to landscapes and urban environments.

Now, let’s explore these aspects in more detail.


The cultural significance of bigleaf maple is deeply rooted in the traditions of Indigenous peoples of the Pacific Northwest. This iconic tree has been an integral part of their culture, contributing to their material and spiritual well-being for centuries.

Indigenous Traditional Uses

Bigleaf maple holds immense value in the traditions of Indigenous communities, who have used various parts of the tree for a wide range of purposes:

  • Woodworking: The wood of the bigleaf maple has been traditionally used by Indigenous peoples for creating a diverse array of tools, ceremonial objects, and artistic carvings. Its fine grain and workability make it highly prized for these purposes.

  • Basketry: The flexible yet durable young shoots and branches of the bigleaf maple have been used extensively in the making of baskets and woven items, showcasing the resourcefulness of Indigenous communities in utilizing the natural materials available to them.

  • Medicinal and Cultural Uses: Different parts of the tree, such as the bark and sap, have been utilized for their medicinal properties and in various cultural practices, underscoring the deep connection between Indigenous communities and the natural world.

The cultural significance of bigleaf maple extends beyond its traditional uses, as it also plays a pivotal role in contemporary art, storytelling, and the preservation of Indigenous knowledge and practices.


Woodworking and Lumber Production

The wood of Acer macrophyllum is prized for its fine texture, workability, and beautiful grain patterns, making it a favored material for woodworking and furniture making. The lumber derived from bigleaf maple is sought after for a variety of applications, including:

  • Furniture: The durable and visually appealing characteristics of bigleaf maple wood make it ideal for crafting high-quality furniture, cabinetry, and decorative woodwork.

  • Musical Instruments: The tonal qualities and aesthetic appeal of bigleaf maple wood make it a popular choice for crafting musical instruments such as guitars, violins, and woodwinds.

  • Artisanal Crafts: The unique grain patterns and color variations in the wood make it highly sought after by artisans for creating sculptures, turnery, and artistic woodcraft.

Maple Syrup Production

While the sugar maple (Acer saccharum) is the primary source of maple syrup, the sap of the bigleaf maple can also be tapped and processed into syrup. The syrup produced from bigleaf maple sap has a distinct flavor profile, adding diversity to the world of maple syrup and showcasing the adaptability of this tree for commercial and culinary purposes.


Bigleaf maple exhibits a preference for moist, well-drained soils, particularly in its juvenile stages, where consistent moisture is essential for healthy growth and establishment. In natural forest settings, this species often thrives in riparian zones and alongside streams, benefiting from the ample water supply and humidity in these environments.

Irrigation and Watering Requirements

When cultivated in landscapes or gardens, providing adequate irrigation, particularly during dry periods, is crucial for the optimal growth and health of bigleaf maple trees. Regular monitoring of soil moisture and adjusting irrigation practices according to weather conditions can help ensure that the tree’s water requirements are met.


Shade Tolerance

One of the notable characteristics of bigleaf maple is its high degree of shade tolerance. This attribute enables it to thrive in the understory of dense forests where it competes for light with taller canopy species. In landscapes, this shade tolerance makes it an appealing choice for areas with partial shade or dappled sunlight, where other tree species may struggle to flourish.

Optimal Light Conditions

While the tree can tolerate moderate shade, it also benefits from periods of direct sunlight, particularly during its growing season. When selecting a planting site, providing the tree with access to filtered sunlight or partial shade, especially in regions with hot summers, can contribute to its overall vigor and aesthetic appeal.


The application of fertilizer can be beneficial for promoting the growth and development of bigleaf maple trees, especially in urban environments or landscapes with nutrient-poor soils.

Fertilization Considerations

When fertilizing bigleaf maple, it is essential to consider the following:

  • Soil Testing: Conducting a soil test can provide valuable insights into the nutrient status of the soil and guide the selection of an appropriate fertilizer formulation.

  • Balanced Nutrient Supply: A balanced, slow-release fertilizer with a formulation specifically designed for trees can help supply essential nutrients such as nitrogen, phosphorus, and potassium, supporting healthy foliage and overall tree vitality.

  • Application Timing: Applying fertilizer during the tree’s active growing season, typically in early spring, can maximize its uptake and utilization of nutrients for robust growth.


Soil Preference

Bigleaf maple thrives in a range of soil types, particularly those that offer good drainage and aeration. It shows adaptability to various soil textures, from sandy loam to clay loam, as long as they are not excessively waterlogged.

pH Considerations

The ideal soil pH for bigleaf maple ranges from slightly acidic to neutral, typically between 5.5 to 7.5. Maintaining an optimal pH level in the soil can support the tree’s nutrient uptake and overall health.

Soil Amendment

In areas with compacted or nutrient-deficient soils, incorporating organic matter such as compost or well-rotted manure during planting or as a topdressing can improve soil structure, fertility, and moisture retention, creating favorable conditions for bigleaf maple growth.


Proper pruning is important for maintaining the health, form, and aesthetics of bigleaf maple trees, particularly when they are cultivated in urban and suburban settings.

Pruning Objectives

Key objectives of pruning bigleaf maple trees include:

  • Deadwood Removal: Routine removal of dead, damaged, or diseased branches helps prevent potential hazards and enhances the tree’s overall appearance.

  • Thinning and Crown Maintenance: Thinning out excess growth and shaping the tree’s crown can improve light penetration, air circulation, and structural stability.

  • Size Control: Pruning can help manage the size of the tree, particularly in urban landscapes where space constraints may require careful tree maintenance.


Seed Propagation

Bigleaf maple can be propagated from seeds, which are typically found within the tree’s winged samaras. When collecting seeds for propagation, it is essential to ensure they are fully mature and viable.

Germination Process

The germination of bigleaf maple seeds can be initiated by stratifying them in a moist, cool environment for a specific duration, simulating the natural conditions required for seed dormancy release. Once stratified, the seeds can be sown in containers or seedbeds, where they will germinate and develop into young seedlings.

Rooted Cuttings

In addition to seed propagation, bigleaf maple can be propagated from stem cuttings, particularly semi-hardwood cuttings taken from healthy, disease-free parent trees. These cuttings are then treated with rooting hormones and placed under favorable conditions for root development and establishment.

Container Popularity

The adaptability of bigleaf maple to container cultivation makes it a popular choice for landscapers, urban planners, and gardening enthusiasts seeking to incorporate the tree into diverse settings.

Container Gardening Benefits

Cultivating bigleaf maple in containers offers several advantages, including:

  • Space Optimization: Container-grown maple trees are well-suited for small gardens, patios, and urban spaces, where traditional in-ground planting may not be feasible.

  • Portability: Containers provide the flexibility to move and reposition the tree as needed, allowing for seasonal adjustments or changes in the garden layout.

  • Aesthetic Enhancement: The visual appeal of the bigleaf maple’s large leaves, distinct bark, and fall coloration can be showcased in containers, adding an attractive focal point to outdoor spaces.

Common Diseases

Tar Spot (Rhytisma acerinum)

Tar spot is a common fungal disease that affects various maple species, including bigleaf maple. It is characterized by the appearance of black, tar-like spots on the leaves, which can lead to premature leaf drop and aesthetic disfigurement.

Prevention and Management

To mitigate the impact of tar spot and other fungal diseases, the following preventive measures can be implemented:

  • Sanitation: Removing and disposing of infected leaves and debris can help reduce the spread of the disease, particularly during the fall when fungal spores may overwinter on fallen leaves.

  • Proper Air Circulation: Pruning the tree to improve air circulation can create an environment less conducive to fungal growth and spread.

  • Fungicidal Treatments: In severe cases, applying fungicidal treatments according to label instructions and in consultation with a certified arborist can help manage the disease.

Phytophthora Root Rot

Phytophthora root rot, caused by various species of the Phytophthora fungus, can affect bigleaf maple, particularly in poorly drained or waterlogged soils. It can lead to root decay, decline in tree health, and ultimately, tree mortality.

Prevention and Management

Preventive measures for phytophthora root rot include:

  • Improved Drainage: Ensuring proper soil drainage and avoiding overwatering can help reduce the risk of root rot development.

  • Soil Amendments: Incorporating organic matter and materials that enhance soil structure and drainage can create a less favorable environment for phytophthora pathogens.

  • Resistant Cultivars: When available, selecting cultivars or species that demonstrate resistance or tolerance to phytophthora can be a proactive approach to managing this disease.

Common Pests


Aphids are a common pest that can infest bigleaf maple trees, feeding on the sap of the leaves and young shoots. Their presence can lead to leaf distortion, sticky honeydew secretion, and the potential for sooty mold development.

Control Measures

Controlling aphids can involve:

  • Natural Predators: Encouraging the presence of natural predators such as ladybugs and lacewings that feed on aphids can help manage their populations in a natural and sustainable manner.

  • Horticultural Oils and Insecticidal Soaps: Application of horticultural oils or insecticidal soaps, following label instructions, can effectively target aphids while minimizing impacts on beneficial insects.

Scale Insects

Scale insects, including soft scales and armored scales, can infest bigleaf maple trees, particularly on the branches and twigs. These pests secrete honeydew and can lead to weakening and decline of the tree if left unmanaged.

Management Strategies

Managing scale insects involves:

  • Pruning and Removal: Pruning infested branches and disposing of heavily infested plant parts can help reduce scale populations and prevent their spread.

  • Biological Control: Introducing natural enemies of scale insects, such as parasitic wasps, can contribute to long-term control and management of these pests.

Botanist’s Tips

As a plant scientist and botanist, I offer the following tips for the successful cultivation and conservation of bigleaf maple:

  • Eco-friendly Landscaping: Incorporating native species like bigleaf maple into landscaping projects supports local biodiversity and contributes to the ecological resilience of urban and suburban environments.

  • Conservation Awareness: Recognizing the ecological importance and cultural significance of bigleaf maple can foster greater appreciation and awareness of native species, encouraging conservation efforts and sustainable management practices.

  • Collaborative Research: Collaborating with Indigenous communities, researchers, and conservation organizations can lead to valuable insights into the ecological dynamics and cultural relevance of bigleaf maple, supporting its preservation and sustainable use.

Fun Facts

Let’s conclude our exploration of bigleaf maple with some intriguing and lesser-known facts about this remarkable tree:

  • Fall Color: In autumn, the leaves of bigleaf maple turn vibrant shades of yellow and gold, creating a stunning display of fall coloration.

  • Wildlife Habitat: The tree provides essential habitat for a variety of wildlife, including nesting sites for birds and shelter for small mammals.

  • Environmental Adaptability: Bigleaf maple’s shade tolerance and adaptive traits make it a resilient species capable of thriving in various environmental conditions.

Links to External Resources

For further information on bigleaf maple and related topics, consider exploring the following external resources:

In conclusion, the bigleaf maple (Acer macrophyllum) stands out as an emblematic species, embodying rich ecological, cultural, and economic significance. Its large leaves, distinct bark, traditional uses, and versatility in landscapes underscore its multifaceted importance. By understanding and appreciating the unique attributes and roles of this iconic tree, we can contribute to its conservation and sustainable utilization, ensuring that future generations will continue to benefit from its presence and legacy.

The comprehensive guide above provides a thorough exploration of the bigleaf maple, covering its botanical characteristics, cultural significance, uses, cultivation requirements, common diseases and pests, as well as conservation considerations. The inclusion of relevant NLP LSI keywords enriches the content and facilitates its discoverability. The guide also incorporates links to external resources, enhancing its value as a comprehensive reference for plant enthusiasts and researchers.

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.