Acer spicatum — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Acer spicatum

Acer Spicatum

Updated · 423 observations
Photo · (c) mariepierlandry6, some rights reserved (CC BY-NC) COURTESY INATURALIST
ON THIS PLANT

Acer spicatum, the mountain maple, dwarf maple, moose maple, or white maple, is a species of maple native to northeastern North America from Saskatchewan to Newfoundland, and south to Pennsylvania. It also grows at high elevations in the southern Appalachian Mountains to northern Georgia.

A note from PlantMom

Mountain maple has strong disease resistance and is generally not susceptible to disease. In terms of care, this plant is fairly low maintenance. When planted outdoors it needs little watering, and larger plants generally do not require pruning. However, smaller plants should be pruned after they have bloomed. Mountain maplet is suitable for anyone with an outdoor space, such as a garden or deck, and does not require a lot of care experience.

— PlantMom
CARE GUIDE

How to keep Acer Spicatum.

Light

Mountain maple needs sunlight for much of the day. While it does best in constant sun, it can tolerate stretches of low light or mostly shaded environments. Even though it comes from areas with abundant sunlight, both excessive and insufficient light can impair its health and growth.

Water

Mountain maple thrives in environments similar to its natural woodland habitat. It prefers cool, moist climates with moderate humidity and can tolerate some drought. To encourage healthy growth and vibrant autumn colors, water the plant every three weeks, ensuring the soil remains evenly moist during the growing season.

Temperature

The hardy mountain maple grows well in temperatures from 32 to 90°F (0 to 32 ℃). Although it stays vigorous in cold conditions, it may need some protection during the hottest parts of summer.

Fertilizer

Proper timing is essential for fertilizing Mountain maple. Apply fertilizer in early spring and continue monthly until early summer. Fertilizer encourages attractive blooms and supplies energy during both dormant and active growth phases.

Pruning

Pruning mountain maples in early spring is beneficial for maintaining their shape and health. The main techniques include removing dead branches and thinning crowded areas to enhance airflow. This practice encourages growth, prevents disease, and enhances the tree's aesthetic appeal, all while maintaining its natural form.

CHARACTERISTICS

Botanical profile.

Plant Type
Tree, Shrub
Life Cycle
Perennial
Genus
Acer
Family
Sapindaceae
Hardiness Zone
3-7
Mature Height
3.05 m to 7.62 m
Mature Spread
3.05 m to 6.1 m
Leaf Color
Green, Yellow
Leaf Type
Deciduous
Flower Color
Yellow
Flower Size
2.54 cm
Bloom Time
Mid spring, Late spring
Planting Time
Spring, Autumn
Harvest Time
Mid summer, Late summer, Early fall
ALSO KNOWN AS

Other names.

en Moose maple en Mountain maple en White Maple
FREQUENTLY ASKED

Reader questions.

How should I water my Mountain maple tree?

To promote excellent root development, it is recommended to place a garden hose at the base of the plant. Be cautious not to directly spray the leaves, as they may require more watering if exposed to direct sunlight outdoors. An alternative option is to use bubblers or soaker hoses to moisten the roots of each plant. When adding or removing plants, it is advantageous to use soaker hoses that can cover the entire garden or bed to ensure deep root growth. It is important to drain any excess water and allow the soil to dry before watering again. To prevent diseases, water at ground level instead of spraying the leaves. On a sunny day, consider spraying the entire bush with water. Whether the plant is potted or in-ground, keep in mind that Mountain maple prefers deep watering rather than light sprinkling.

Why do I have to give plant food to my Mountain maple tree?

If you own a Mountain maple, regardless of the type, regular fertilization is important for the plant's overall health. Providing the proper nutrients helps the plant grow more vigorously and become more resilient to tough conditions, as well as better equipped to fight diseases and pests. The foliage of the Mountain maple is one of its most appealing attributes, so it is important to maintain it. To do this, you should establish and stick to a regular fertilization schedule that is specific to your Mountain maple. By doing so, your plant will develop leaves with a deep color and a lush appearance.

What are the sunlight requirements for Mountain Maple?

Mountain Maple (Acer spicatum) thrives best in full sun conditions, requiring more than 6 hours of sunlight daily. However, it can also adapt to partial sun and full shade environments, which means about 3-6 hours of sunlight. It's essential to observe the movement of sunlight in your garden to find the perfect balance for your plant, ensuring it gets the right amount of light without suffering from excessive exposure.

What are the ideal growing temperatures for mountain maple?

The mountain maple (Acer spicatum) thrives in a temperature range from 32 to 90°F (0 to 32°C). This species demonstrates considerable resilience to cold, comfortably enduring frigid temperatures without requiring special frost protection measures. In preparation for winter, it's beneficial to water the plant thoroughly before the first freeze to help maintain soil moisture when it enters a frozen state, ensuring the plant doesn't suffer from drought during the colder months. Despite its high tolerance to cold, protection might be needed during the peak of summer to mitigate the effects of extreme heat.

What should I do if I give the Mountain maple tree too much water or too little water?

An overwatered Mountain maple may exhibit signs such as yellowing, dropping, and wilting leaves. Additionally, the plant may appear dull and unhealthy with soft mushy stems. When these symptoms arise, it is best to adjust your watering schedule accordingly. Conversely, wilting can also indicate under watering, characterized by crispy and dry leaves. In such cases, checking the soil's dryness and providing a thorough watering is recommended. While sufficient moisture can help the Mountain maple recover, the damaged root system may still cause the plant to have dry, yellow leaves in the following days. Once the plant returns to normal, the yellowing of leaves will cease. Ensure to regularly check the moisture levels of potted Mountain maples indoors, avoiding overwatering and assessing for signs of black spots. If present, allow the soil to dry by refraining from watering for a few days. Overwatering can lead to root rot, which may necessitate transferring the plant to a different pot, particularly if discolored and slimy roots are observed. Therefore, it is crucial to prevent root rot by avoiding excessively soggy soil. When planting a Mountain maple outdoors, dig deeper and assess the soil's dryness with your fingers. If the soil is too dry, it indicates underwatering, and adequate watering is necessary to aid the plant's recovery.

When should I put fertilizer on my Mountain maple tree?

To ensure healthy growth, it is recommended to fertilize your Mountain maple during late winter or early spring. This will provide the necessary nutrients for the tree. If you live in a warm climate region, it can also be beneficial to fertilize in early fall. This will add nutrients for the following growing season and help the tree withstand winter cold without foliage damage. Fertilizing earlier will give the new branches sufficient time to grow and endure the cold winter.

How does Mountain Maple react to different light conditions?

Mountain Maple is adaptable and can grow under various light conditions. It flourishes with substantial sun exposure but can also withstand periods of less sunlight or shaded conditions. Despite its adaptability, the plant's health and growth might be compromised if it receives too much or too little sunlight. In indoor environments or during less sunny months, artificial lighting can be used to supplement natural sunlight, ensuring optimal growth. LED lights are recommended for their ability to be customized to specific plant needs, with full sun plants requiring 30-50W/sq ft, partial sun plants 20-30W/sq ft, and full shade plants 10-20W/sq ft of artificial light.

How does low temperature affect mountain maple, and what are the recommended solutions?

Mountain maple is exceptionally tolerant of cold weather, capable of withstanding temperatures as low as -35°C (-31°F) without substantial damage. However, prolonged exposure to temperatures below this threshold can lead to brittleness and drying of the branches, resulting in a lack of new shoot growth in the spring. To mitigate these effects, it is recommended to prune away any dead branches that have not produced new leaves in the spring. This helps the plant maintain its health and encourage new growth.

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

The Mountain maple prefers deep, infrequent watering. For potted plants, it is important to soak them in a gallon of water each time due to limited water storage and faster soil drying. In cold regions, watering is needed every 3 to 5 days. It is best to water in the morning when the soil is dry, both indoors and outdoors. You can check the soil moisture by feeling the top 2-3 inches. If dry, it's time for a full watering. During hot weather, daily moisture checks may be necessary as heat can quickly dry out potted soil. For gardens, irrigation is also necessary. In hot climates, watering once a week is recommended when about 2-3 inches of soil becomes too dry. Avoid overwatering if there is already sufficient rainfall to prevent root rot. Adding mulch about 3 to 4 inches deep helps conserve water when the plants are outdoors. Sandy soil requires more frequent watering, while clay soil can go 2-3 days without watering to avoid root rot. You can mark watering dates on a calendar and watch for drooping leaves as a sign of possible delayed watering.

When is the best time to not fertilize my Mountain maple?

There are a few times of the year when you should avoid fertilizing your Mountain maple. First, during the early and mid-winter months when the tree is dormant and doesn't require feeding. Second, it's not recommended to fertilize the plant in late spring and throughout the summer due to hotter and drier weather conditions. Fertilizing during this time can have a negative impact on the tree. To prevent any issues, it's best to stick to a fertilization schedule that involves feeding only in early spring and early fall.

What symptoms indicate Mountain Maple is not receiving enough sunlight?

When Mountain Maple lacks sufficient sunlight, it may show symptoms such as smaller new leaves, leggy or sparse growth, faster leaf drop, slower or halted growth, and lighter-colored new leaves. These signs indicate the plant isn't receiving the light it needs to thrive. Additionally, excessive sunlight can cause chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms highlight the importance of optimizing the light exposure for Mountain Maple to maintain its health.

How does high temperature affect mountain maple, and what are the recommended solutions?

Mountain maples struggle in high temperatures, particularly when the mercury rises above 32°C (90°F). Such conditions can cause significant leaf drop, and in serious cases, may lead to the entire plant withering and dying. To help the plant cope, it's suggested to trim away any parts of the plant that have been sunburned or dried out. Relocating the plant to a shadier spot or utilizing a shade cloth can provide relief from the midday and afternoon sun. Additionally, watering the plant in the morning and evening can help keep the soil consistently moist, alleviating some of the stress caused by high temperatures.

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