Acer macrophyllum
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Acer macrophyllum

Bigleaf maple · Pacific maple · Big-leaf maple · Oregon maple · British Columbia maple

Tier 1 Difficulty: easy Water: moderate Light: full_sun Toxicity: low
Water every
7 days
Temperature
10–35 °C
Soil pH
5–6
Hardiness
Zone 5–9
Click count
1,307
Observations
1,009

Description

Source: leafsnap

Acer macrophyllum, commonly known as the bigleaf maple, is a deciduous tree species native to the western regions of North America. It can grow up to 100 feet tall and boasts a broad crown with leaves that can reach up to 12 inches in diameter. These leaves are deeply lobed and display a bright green color in the spring and summer, turning yellow or orange in the fall. The bigleaf maple produces small yellow-green flowers in early spring before its leaves emerge. These flowers are followed by winged seeds known as samaras, which ripen from late summer through fall. This species prefers moist soils and typically grows along streams or on hillsides throughout its range. It plays an important role in the ecosystem, providing a source of food for wildlife such as deer, elk, bears, squirrels, and birds. The wood of Acer macrophyllum is valued for its strength and durability, making it suitable for furniture making and musical instruments. Additionally, Native American tribes have historically used various parts of the plant for medicinal purposes, such as treating headaches or colds. Overall, Acer macrophyllum is an ecologically important species, offering habitat for numerous wildlife species and holding cultural significance due to its diverse uses by humans throughout history.

🌳 The beautifully grained wood of bigleaf maple is not only valued for furniture making, but its sap is also a source of sweet syrup. Notably, Native Americans made baskets and clothing from fibers of the tree's inner bark. This sturdy bark could inspire innovations in textiles. Additionally, bigleaf maple grows in places where groundwater—and sometimes gold—is found, signaling prospectors to potential gold-bearing sites.

🎭 Love, longevity money. Because of its sugar and syrup, it symbolizes success and abundance.

Care Guide

💧 Water Every 7 days

Originating from the Pacific Northwest, the bigleaf maple thrives in humid environments and prefers consistent moisture without becoming waterlogged. It should be watered every 1-2 weeks. Typically grown outdoors, the bigleaf maple benefits from mulching, which helps retain moisture and mimics its natural forest floor habitat.

Suggested frequency: Every 7 days
FAQ
How should I water my Bigleaf maple tree in the best way?

To promote excellent root development, it is recommended to place a garden hose at the base of the plant. It is important to avoid spraying the leaves directly and keep in mind that leaves may need more water if they are exposed to direct sunlight outdoors. To moisten the roots, bubblers can be used for each plant, and soaker hoses can cover the entire garden or bed when adding or removing plants to ensure deep root penetration. After watering, any excess water should be drained and the soil allowed to dry before watering again. Watering at ground level is advised to prevent diseases. On sunny days, it may be beneficial to spray the entire bush with water. Whether the plant is in a pot or in-ground, it's important to remember that Bigleaf maple prefers deep watering rather than light sprinkling.

What should I do if I give Bigleaf maple too much or too little water?

An overwatered Bigleaf maple will have yellow leaves that drop off and wilt. The plant will also look dull and unhealthy, with mushy stems. When you notice these signs, it's best to adjust your watering schedule. On the other hand, wilting can also indicate under watering. In this case, the leaves will turn crispy and dry. Make sure to check the soil for dryness and provide a thorough watering when necessary. However, even with enough water, the Bigleaf maple may still appear dry with yellow leaves due to a damaged root system. Once it fully recovers, the yellowing of leaves will stop. When keeping the Bigleaf maple indoors, always check the moisture levels in the pot. Avoid overwatering and watch out for black spots, which indicate potential issues. If black spots are present, allow the soil to dry by withholding watering for a few days. Overwatering can lead to root rot, so consider transferring the plant to a different pot if you notice discolored and slimy roots. Always prevent root rot by avoiding excessively soggy soil. When planting a Bigleaf maple outdoors, dig a little deeper. If the soil feels too dry when you check with your fingers, it might be underwatering. Adequate watering is necessary for the plant's recovery.

How often should I give water to my Bigleaf maple tree?

The Bigleaf maple prefers deep and infrequent watering, especially when planted in pots. Water them with a gallon of water each time. Potted plants have limited water storage, so the soil will dry out faster. In cold regions, water every 3 to 5 days. Water in the morning when the soil is dry, indoors or outdoors. Check the soil to determine if watering is needed. When the top 2-3 inches of soil is dry, it's time for a full watering. On hot days, check the moisture daily as the heat can quickly dry out the soil. If you have a garden, irrigation is necessary. In hot climates, water once a week when the soil is 2-3 inches too dry. Consider rainfall and avoid overwatering to prevent root rot. Additional watering may not be needed if there is sufficient rainfall. During spring and fall, when the Bigleaf maple is growing, add 3-4 inches of mulch to conserve water when planted outdoors. Sandy soil requires more frequent watering, while clay soil requires less frequent watering to prevent root rot. Keep track of watering dates and observe drooping leaves as a sign that watering may be overdue.

How much water does my Bigleaf maple tree need?

The Bigleaf maple generally needs about a gallon of water on a regular schedule. For potted plants, water them deeply until the water is dripping from the bottom of the pot. Wait for the soil to dry before watering again. Use a water calculator or moisture meter to determine how much water you have given the plant in a week. Give plenty of water during the flowering period, but let the moisture evaporate to prevent root rot. If the Bigleaf maple is planted outside with adequate rainfall, it may not need extra watering. When the Bigleaf maple is young or newly planted, ensure it receives 1-2 inches of rain per week. As the Bigleaf maple grows, it can rely on rainfall alone. Only water it fully during the cooler times of the day when the weather is too hot or when there is no rainfall for 2-3 weeks to prevent heat damage. Additional watering will be needed during extended dry spells.

Should I water my Bigleaf maple more or less depending on the time of year or weather conditions?

The Bigleaf maple prefers outdoor conditions with regular rainfall, but it can tolerate dry spells. During the spring and fall growing seasons, the soil should be kept moist but not waterlogged. Alternating between dry and moist soil conditions is ideal for its growth. In the summer, hot weather can cause water to evaporate quickly, so additional watering may be necessary if there is a lack of rainfall. During the winter, less water is generally needed as the tree goes dormant and drops its leaves. Using a well-draining soil mixture can help water evaporate efficiently. Once the tree starts to leaf out in spring and go dormant in winter, watering can be skipped as it can rely on fall and winter rains to survive. When cultivating the Bigleaf maple, good drainage is essential, especially during winter and when flowering. If the plant is in a pot, its root growth is limited, so it should be well-watered in summer. It's important to provide adequate drainage to prevent cold and wet roots. Deep soaking the entire root system once or twice a week, depending on the weather, is best instead of shallow sprinkling. It's important to avoid letting the tree dry out completely during fall and winter, even when it is dormant. Over-watering should be avoided as well to prevent root rot. Applying mulch can help reduce stress, conserve water, and promote healthy blooms.

☀️ Light Full sun

Bigleaf maple grows best with sunlight all day but can tolerate sites where the sun is not constant. The intensity of light is closely tied to its preferred growing conditions. Both too little and overly intense sunlight can negatively affect the tree's health and growth rate.

Ideal: Full sun
FAQ
What are the sunlight requirements for Bigleaf maple?

Bigleaf maple requires full sun, characterized by more than 6 hours of sunlight per day, but it can also manage in partial sun, which is about 3-6 hours of sunlight. It's important to observe how sunlight moves through your garden to choose spots that provide the right balance of light and shade, ensuring the plant's well-being. The intensity of the sunlight is crucial for its growth, as both insufficient and excessive sunlight can affect its health and growth rate adversely.

How does artificial lighting support Bigleaf maple's growth?

Indoor Bigleaf maple plants require adequate lighting, especially when natural sunlight is insufficient. Artificial lights can significantly promote healthier and faster growth. LED lights are preferred for their ability to provide specific wavelengths needed by plants. Full sun plants benefit from 30-50W per square foot of artificial light, partial sun plants need 20-30W per square foot, and full shade plants require 10-20W per square foot. It's important to place the light source 12-36 inches above the plant to mimic natural sunlight and ensure the plant receives 8-12 hours of light per day.

What are the symptoms of insufficient sunlight in Bigleaf maple?

When Bigleaf maple does not receive enough sunlight, it may develop smaller new leaves, experience leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored leaves indicating a lack of chlorophyll. Additionally, chlorosis may occur, where leaves turn yellow due to the breakdown of chlorophyll. Sunscald, leaf curling, wilting, and leaf scorching are other symptoms that can arise from excessive sunlight exposure and may affect the plant's ability to photosynthesize and maintain its health.

What are some solutions for dealing with insufficient sunlight for Bigleaf maple?

To address insufficient sunlight for Bigleaf maple, gradually move the plant to a sunnier location, ensuring it receives at least 6 hours of direct sunlight daily. For indoor plants, use a south-facing window or consider artificial lighting, like a desk or ceiling lamp turned on for at least 8 hours or invest in professional plant grow lights. For outdoor plants, avoid sudden changes in light intensity to prevent sunburn. It's also advisable to minimize obstructions by pruning nearby trees and consider transplanting smaller plants to sunnier locations during their dormant period. Note that while parts of the plant affected by insufficient light may not recover, new growth should be healthier with increased light exposure.

🌡️ Temperature 10–35°C

Bigleaf maple is native to areas with a moderate maritime climate. It does best when temperatures are between 50 and 95 ℉ (10 to 35 ℃) and prefers moderate humidity. In winter the plant can adapt to cooler temperatures, but prolonged exposure to freezing conditions may cause frost damage. In summer, supplying adequate water is important to prevent the leaves from drying out and becoming scorched.

Ideal temperature: 10–35°C
FAQ
What is the native climate for Bigleaf Maple?

Bigleaf maple is native to regions with a moderate maritime climate. It thrives in temperatures that range from 50 to 95°F (10 to 35°C) and prefers conditions of moderate humidity. While the plant shows strong resistance to cold and does not usually require special frost protection, it can suffer from frost if subjected to prolonged freezing conditions. In the warmer months, adequate hydration is essential to prevent leaf desiccation and scorch. Ensuring the soil is moist before the first freeze in autumn can help the plant withstand winter and early spring conditions.

What should be done if winter temperatures drop below -25°C?

If winter temperatures are anticipated to fall below -25°C, it's vital to protect your Bigleaf maple from the cold. You can safeguard the tree by wrapping the trunk and branches with insulating materials like non-woven fabric or cloth. This preparation is essential for helping the tree avoid damage from the severe cold.

How does Bigleaf Maple respond to low and high temperature extremes?

Bigleaf maple has distinct responses to temperature extremes. At temperatures below -25°C, the tree may not show immediate distress during winter, but come spring, the branches may turn brittle, dry, and fail to produce new shoots. On the other end of the spectrum, when temperatures exceed 38°C, the leaves might fade, with tips becoming dry and prone to sunburn. Managing these conditions requires proactive measures; for cold damage, prune away dead branches in spring to encourage new growth. To combat heat stress, trim sunburned areas, provide shade during peak sunlight hours, and ensure the soil remains moist through regular watering in cooler parts of the day.

What is the botanical name of Bigleaf maple?

The botanical name of Bigleaf maple is Acer macrophyllum. It is a species well-adapted to its native moderate maritime climate, requiring certain conditions for optimal growth and health.

💨 Humidity
Humidity:
🪴 Soil 5-6
Soil pH: 5-6
🌱 Fertilizer

Apply fertilizer to your Bigleaf maple in early spring to encourage healthy growth. Consistent feeding boosts its overall health, leading to vigorous development, greater resilience in challenging conditions, and improved resistance to diseases and pests. Keep to a defined fertilization timetable for your Bigleaf maple so the foliage remains vibrant, richly colored, and lush in appearance.

FAQ
Why do I have to put fertilizer on my Bigleaf maple?

No matter what type of Bigleaf maple you have, regular fertilization is important for the plant's overall health. Giving it the right nutrients will promote stronger growth and make it more resilient to tough conditions, as well as better equipped to fight diseases and pests. Your Bigleaf maple's foliage is a key feature, so it's essential to maintain it. This involves following a regular and specific fertilization schedule, which will result in leaves that are vibrant in color and have a lush appearance.

When should I fertilize my Bigleaf maple to get the best results?

To take care of your Bigleaf maple tree, you should fertilize it twice a year. The first time is in late winter or early spring to provide essential nutrients for healthy growth in warm weather. If you live in a warm climate region, it's also helpful to give another round of fertilizer in early fall. This will give the tree additional nutrients for the next growing season and improve its ability to withstand winter cold. Fertilizing earlier in fall will promote branch growth and prepare the tree for the colder months.

When is it not a good idea to fertilize my Bigleaf maple?

There are certain times of the year when you should avoid fertilizing your Bigleaf maple. The first instance is during the early and mid-winter months when the tree is dormant and does not require any feeding. Additionally, it is not advisable to fertilize the plant in late spring and throughout the summer. This period usually has hotter and drier weather conditions, which can have a negative effect on the tree if it is fertilized. To prevent any problems, it is best to only feed your Bigleaf maple in early spring and early fall according to a regular fertilization schedule.

What kind of fertilizer does my Bigleaf maple tree need?

Bigleaf maples primarily require nitrogen as their main nutrient, but phosphorus and potassium should not be overlooked. While balanced fertilizers like the 10-10-10 can be effective, optimal growth for Bigleaf maples is typically achieved with a more specific nutrient ratio. Fertilizers with slightly higher levels of nitrogen, such as a 10-6-4 ratio, often yield better results. Granular or liquid-based fertilizers can both be used for fertilizing.

How do I help my Bigleaf maple tree grow better?

To fertilize your Bigleaf maple tree, you have two options: granular fertilizer or liquid fertilizer. If you choose granular fertilizer, simply sprinkle it onto the soil at the right time. This type of fertilizer releases nutrients slowly over time, so there's no need to worry about overfeeding your tree. Before applying the fertilizer, it's a good idea to lightly water your tree. Alternatively, you can use liquid fertilizer, although this is less common. To do this, mix the fertilizer with water and pour the mixture around the base of your Bigleaf maple. If you want to be thorough, consider conducting a soil test before fertilizing. This will help you determine if the pH of the soil needs to be adjusted before adding any fertilizer.

🪴 Pot & Repot
✂️ Pruning

To care for bigleaf maple trees, it is important to prune them in early spring before new growth begins. Focus on removing dead or damaged branches and thinning out dense areas to improve air circulation. This practice helps prevent disease, promotes healthy growth, and enhances the tree's appearance, ultimately ensuring the longevity and vitality of the bigleaf maple.

🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Tree
Life Cycle
Perennial
Genus
Acer
Family
Sapindaceae
Hardiness Zone
6-9
Mature Height
14.94 m to 48.16 m
Mature Spread
15 cm to 30 cm
Leaf Color
Green, Yellow, Orange
Leaf Type
Deciduous
Flower Color
Yellow, Green
Flower Size
2.54 cm
Bloom Time
Mid spring, Late spring
Planting Time
Summer, Autumn
Harvest Time
Mid summer

Tags (24)

Common Names (9)

en Bigleaf maple
en Pacific maple
en Big-leaf maple
en Oregon maple
en British Columbia maple
en Broadleaf maple
en Big-leaved Maple
en Broad-leaved Maple
en Canyon Maple