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Large deciduous tree
Sapindaceae
Large Canadian Zone 3 native maple for moist soil
Red maple
Acer rubrum
Red maple is a large Canadian native tree, generally 15 to 25 m high and 10 to 15 m wide. Green leaves with three to five lobes become yellow, orange or red in autumn, without a guarantee of uniform scarlet colour on a seed-grown species tree. Very early reddish flowers precede paired samaras in early summer. Hardy in Canadian Zone 3, it prefers full sun to light partial shade and moist, acidic, uncompacted soil. Avoid alkaline soil, salt exposure and horse pasture because wilted leaves are toxic to horses. The 200 and 225 cm sale heights do not change mature dimensions.
200 cm and 225 cm
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- Quantity
- 200 cm and 225 cm
- Exposure
- Full sun or light partial shade
- Hardiness
- Canadian Zone 3
Discover the plant
Common nameRed maple; swamp maple; soft maple
FamilySapindaceae
GenusAcer
Speciesrubrum
TypeLarge deciduous tree
Botanical nameAcer rubrum
Red maple (Acer rubrum) is a large deciduous tree native to eastern North America and present in Canadian forests and wetlands. Its oval to rounded crown generally reaches 15 to 25 m in height and 10 to 15 m in width. Opposite leaves have three to five shallow lobes and toothed margins. They remain green through summer, then turn yellow, orange or red in autumn; a seed-grown species tree does not guarantee the uniform scarlet display of a selected cultivar. Reddish flowers open very early in spring before the leaves, followed by often-red paired samaras that mature in early summer. Young grey bark becomes darker and plated with age.
Hardy in Canadian Zone 3, red maple prefers full sun or light partial shade and moist, acidic, organic soil that drains between wet periods. It accepts several textures, including clay and sand, but may develop chlorosis in alkaline soil and stress on dry, compacted or salt-affected sites. Water deeply through the first two growing seasons, keep the root flare visible and maintain 5 to 8 cm of mulch without touching the trunk. Develop well-spaced scaffold branches early because crowded unions and overloaded limbs can be damaged by wind or ice. Test soil before attempting to correct pale foliage, and protect the expanding root zone from construction traffic.
Use a red maple tree for shade in a large residential garden, park, managed woodland edge or rain garden whose soil genuinely matches the species. Reserve its mature crown and a broad uncompacted soil volume away from overhead services, buildings and pavement. This Canadian native feeds some squirrels, rodents, deer and rabbits while providing very early flowers visited by insects. It is not suitable beside horse pasture: wilted or partially dried leaves can cause severe poisoning in horses and ponies. Prevent pruned branches and windblown leaves from reaching feeding areas. Correct siting, structural training and moisture management provide more dependable long-term value than choosing the species solely for expected red fall colour.
Planting guide
From planting to establishment.
Spacing / density
Space 10 to 15 m (33 to 49 ft) apart according to crown size and infrastructure
Best planting time
Spring or early autumn, allowing enough time for rooting before freeze-up
Propagation
Seed for the species, followed by nursery selection
Soil and care
The right care,at the right time.
Minimum temperature
Approximately -40 °C (-40 °F)
Care level
Moderate
Watering
Water slowly and deeply after planting, then keep the root ball and neighbouring soil evenly moist through the first two growing seasons. Check moisture beneath mulch before irrigating again and expand the watered area as roots extend. An established tree tolerates a short dry period, but the species remains more dependable with consistent moisture. During prolonged drought, irrigate deeply rather than applying small daily amounts beside the trunk. Avoid permanently stagnant water as well, and correct drainage that chronically deprives roots of oxygen. Monitor more often beside heat-storing pavement or during hot wind.
Soil type
Choose acidic, organic, moist soil that drains between wet periods. Red maple grows in loam, clay, sand and silt, but high pH can cause chlorosis visible between leaf veins. Loosen a broad area, keep the root flare at grade and protect soil from compaction. Avoid calcareous fill, road salt and permanent submersion. Test soil before attempting a chemical correction, because pale foliage may also result from damaged roots, drought or drainage problems. Match the species to the existing site instead of repeatedly altering unsuitable soil.
Fertilization
In suitable soil, 5 to 8 cm of organic mulch and a thin surface layer of mature compost in spring are generally sufficient. If growth or colour appears weak, test the soil before adding a labelled tree fertilizer. Avoid heavy nitrogen, products placed against the trunk and late feeding, which extends soft growth before Canadian cold weather. Correct drainage and watering before assuming fertilizer will solve limited growth.
Moisture
Moist soil with drainage between wet periods
Seasonal care
In spring, inspect the trunk, root flare and major branch unions after snowmelt and ice events. Restore 5 to 8 cm of mulch without covering bark, remove tight ties and water when rainfall is inadequate. Observe reddish flowers and later samaras to follow the seasonal cycle. In summer, check moisture, drainage and compaction. When leaves become pale between the veins, test soil and assess roots before adding a product. Watch for aphids, scales, leafhoppers, anthracnose, tar spot, cankers and Verticillium symptoms, then request a diagnosis before treating. After leaves expand, remove only dead, broken, diseased or crossing wood and gradually subordinate competing branches. Never top the crown. In autumn, observe colour without confusing yellow or orange with deficiency, water before freeze-up when soil is dry and collect heavily spotted leaves. In winter, direct salt-laden snow elsewhere and protect a young trunk from rodents without tightening the guard. After storms, keep the area beneath the crown clear until inspection. Assign major limbs, cracks and elevated work to an arborist. Near equine property, collect every wilted branch or leaf promptly and prevent wind from carrying debris into pasture. Photograph the same unions annually to follow structural changes and reassess clearance from buildings and overhead services. Also verify clearance from wires, buildings and paths as the crown expands, and keep maintenance access open around the root zone.
Bloom and dimensions
Its place,in your garden.
Mature height
20 to 25 m (66 to 82 ft)
Width / spread
10 m (33 ft)
Flower color
Reddish, sometimes yellowish
Foliage color
Green in summer; variable yellow, orange to red in autumn
Foliage type
Deciduous
Growth rate
Moderate
Growth habit
Oval to rounded, becoming broadly spreading
Bloom period
Small reddish flowers, sometimes more yellow on individual trees, open in clusters very early in spring before the leaves. Across Canada, timing follows warming weather and varies by region. They create a subtle coloured haze among twigs and offer an early resource to some insects. Avoid non-targeted insecticides during this period. Fertilized flowers quickly produce often-red paired samaras that mature and fall in early summer. Quantity varies among trees and with late frost. Flower colour alone should not be used to distinguish the species from related maples.
Fruiting
Paired samaras approximately 1.2 to 2.5 cm long, often red when young, mature in early summer. They fall earlier than the fruit of many other maples and can germinate quickly on bare moist soil. Clear them from gutters or young beds and remove misplaced seedlings while small. Fruit feeds squirrels and other rodents. A seed-grown plant belongs to the species, but its form and autumn colour may differ from the parent tree. Do not allow volunteers to develop beside foundations, drains or other infrastructure where later removal would disturb roots.
Harvest
FALSE
Garden associations
In goodcompany.
Companion plants
Pair red maple with native plants for moist acidic soil, such as winterberry, highbush blueberry, red-osier dogwood, sweetgale, sedges, ferns and woodland-edge perennials matched to the site. Establish them toward the future crown perimeter without cutting major roots, covering the flare or obstructing inspection. Avoid invasive species and plants requiring alkaline or very dry soil. Keep an open zone around the young trunk and choose each companion according to the actual duration of moisture. Diverse layers provide habitat without forcing unsuitable irrigation around the maple.
Frequently asked questions
Your questions,answered.
Does red maple always turn scarlet in autumn?
No. A seed-grown Acer rubrum may become yellow, orange, red or display several tones within one crown. Tree genetics, soil acidity, moisture, exposure, leaf health and autumn temperatures influence the result. Named cultivars are selected for particular traits, but this listing represents the species without a cultivar. Provide moist acidic soil, sun and an uncompacted root zone to support good foliage quality without promising one precise shade. Summer chlorosis between the veins is not autumn colour; test soil and assess roots before adding an amendment in that situation. Compare seasonal photographs before deciding that normal variation indicates a problem. Annually.
How can red maple be distinguished from silver maple?
A red maple leaf has three to five relatively shallow lobes separated by less deeply cut sinuses, and its margins are toothed. The sides of the central lobe run nearly parallel to the midvein. A silver maple leaf is much more deeply cut and its white-silver underside flashes more strongly. Red maple samaras are smaller, often red when young and mature in early summer. Because the two species can hybridize, some trees show intermediate traits. Compare several leaves, fruits, buds and bark, then request professional identification when the distinction affects a planting decision, particularly near horses. Do not identify either species from autumn colour alone.
What soil suits red maple?
Choose acidic, organic, moist and uncompacted soil. The species accepts loam, clay, sand and silt, but drainage should let roots regain oxygen between wet periods. Alkaline soil can cause chlorosis, in which leaf tissue pales between greener veins. Do not automatically add iron or acidifier because damaged roots, drought and standing water can create similar symptoms. Test soil and examine drainage first. Keep the root flare visible, protect a broad root zone with mulch and direct road salt elsewhere. On a persistently calcareous site, select a tree adapted to existing conditions instead of relying on repeated chemical correction. Long-term soil compatibility supports both colour and structure.
Why should red maple be kept away from horses?
Wilted or partially dried red maple leaves can destroy red blood cells in horses and ponies, causing severe and sometimes fatal haemolytic anaemia. Exposure may follow a broken limb, pruning debris left beside a fence or leaves carried by wind. Do not plant Acer rubrum around pasture and keep branches beyond reach. Remove debris immediately and never place it in an accessible manure pile. Weakness, darkened mucous membranes or red-brown urine after suspected ingestion constitute a veterinary emergency. Contact a veterinarian immediately instead of waiting for every sign to appear. Fresh-looking foliage does not justify allowing the tree to overhang an equine area because branches can wilt after storms.
How should a young red maple be pruned?
Begin by retaining a well-formed trunk and scaffold branches distributed vertically around it. Gradually subordinate a competing branch rather than removing substantial foliage in one year. After leaves expand, remove only dead, broken, diseased or crossing wood and misplaced shoots. Cut just outside the branch collar without leaving a stub or injuring the trunk. Never top the crown because vigorous regrowth creates weak attachments. Correct planting distance reduces future pruning. Assign a large limb, crack, cavity or elevated work to a certified arborist. After ice events, keep the area clear until inspection. Photograph major unions annually so changes in loading and included bark can be compared over time.
Wildlife and pets
Life,around your plants.
Native plant
Yes
Reported toxicity
Yes
Supporting wildlife
As a native tree, red maple produces samaras eaten by squirrels and other rodents. Shoots and foliage may feed white-tailed deer or rabbits, while the crown provides cover and resting sites. Early flowers may be visited by insects. Add several native plant layers and avoid non-targeted pesticides. This wildlife value does not remove the toxicity of wilted leaves to horses, so equine areas require complete exclusion.