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Small deciduous tree or large shrub
Sapindaceae
Zone 5 full moon maple with luminous yellow foliage
‘Aureum’ golden full moon maple
Acer shirasawanum ‘Aureum’
Aureum is a slow-growing Japanese full moon maple with a broadly upright habit and luminous yellow foliage. Rounded, many-lobed leaves open bright yellow to yellow-green, remain golden in gentle summer light and may become golden yellow to orange in autumn. Upright crimson flowers appear in spring. Hardy in Canadian Zone 5, it prefers bright partial shade, a sheltered site and organic, evenly moist, very well-drained soil. Iseli lists approximately 3 by 2.1 m at garden size, but an old specimen may reach 5 to 6 m. Protect it from salt, drying wind and intense sun while allowing room for a broad mature crown.
6, 10, 15, and 20 gallons
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- Quantity
- 6, 10, 15, and 20 gallons
- Exposure
- Bright partial shade, filtered light or gentle morning sun; protect from intense sun
- Hardiness
- Zone 5
Discover the plant
Common nameAureum golden full moon maple; golden Shirasawa maple
FamilySapindaceae
GenusAcer
Speciesshirasawanum
CultivarAureum
TypeSmall deciduous tree or large shrub
Botanical nameAcer shirasawanum ‘Aureum’
Aureum golden full moon maple (Acer shirasawanum ‘Aureum’) is a slow-growing Japanese small tree or large shrub valued since the nineteenth century for luminous foliage. Opposite, rounded leaves divided into numerous fine lobes open bright yellow to yellow-green and retain a golden appearance through summer when protected from scorching sun. They may become golden yellow to orange in autumn, although fall colour varies with site and season. Crimson flowers stand in small upright clusters above the foliage in spring, followed by discreet winged samaras. The habit becomes broadly upright, bushy and rounded with age, creating a layered canopy rather than a narrow or permanently dwarf form.
Hardy in Canadian Zone 5, Aureum prefers a site sheltered from drying wind, road salt and reflected heat. Bright partial shade, filtered light or gentle morning sun protects yellow leaves better than intense afternoon exposure. Provide organic, evenly moist, well-drained soil that is slightly acidic to neutral. Keep the root flare visible, maintain 5 to 8 cm of mulch without touching the trunk and water deeply through the first two growing seasons. Growth of 15 to 30 cm per year requires little pruning. Avoid heavy routine feeding; a soil test and light surface compost are usually more appropriate. Consistent moisture supports leaf quality without saturating roots.
Use Aureum as a luminous focal point in a protected courtyard, Japanese-style garden, open woodland edge or bed viewed from the house. Iseli lists a garden size near 3 m by 2.1 m, while long-term references show that an old specimen may reach 5 to 6 m in both directions. Reserve more space than the young container plant suggests. Sale formats from 6 to 20 gallons do not alter mature dimensions. A large pot remains temporary in cold Canadian regions because roots are more exposed to freezing; sheltered in-ground planting is more reliable. Thoughtful placement preserves colour and form with minimal corrective work.
Planting guide
From planting to establishment.
Spacing / density
Space 5 to 6 m (16 to 20 ft) apart for long-term mature potential
Best planting time
Spring or early fall, allowing enough time for rooting before freeze-up
Propagation
Nursery grafting to preserve the cultivar faithfully
Soil and care
The right care,at the right time.
Minimum temperature
Approximately -29 °C (-20 °F) in a sheltered site
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. Continue watering during extended rain-free periods, particularly in a sunny site or beside a heat-storing surface. Avoid small daily applications against the trunk, standing water and repeated swings between complete dryness and saturation. Expand the watered area as roots extend beyond the original planting hole.
Soil type
Choose organic, evenly moist, very well-drained soil that is slightly acidic to neutral. Loam enriched with organic matter suits the tree better than compact clay or rapidly drying sand. Loosen a broad area, set the root flare at grade and preserve uncompacted soil beyond the root ball. Avoid saturated depressions, alkaline fill and saline runoff from paving. Soil structure and moisture balance matter more than applying a precise pH value without testing.
Fertilization
In well-prepared organic soil, a thin surface layer of mature compost in spring and 5 to 8 cm of organic mulch are generally sufficient. If growth or colour appears weak, test the soil before using a mild labelled tree fertilizer. Avoid heavy nitrogen, product against the trunk and late feeding that extends soft growth before Canadian winter. Correct light, drainage and irrigation before assuming fertilizer will improve foliage colour.
Moisture
Evenly moist soil without standing water
Seasonal care
In spring, inspect the trunk, graft union, root flare and main branch unions after snowmelt. Restore 5 to 8 cm of mulch without covering bark, remove tight ties and water when rainfall is inadequate. Observe crimson flowers and compare bud break across several branches before declaring winter injury. In summer, check moisture, drainage, reflected heat and exposure when margins brown. Watch for aphids, mites, scale insects, leaf spots, cankers and Verticillium symptoms, then obtain a diagnosis before treating. Prune after leaves expand to remove only dead, broken, diseased or crossing wood and rootstock shoots. Never top the crown or try to keep it artificially dwarf. In autumn, observe golden-yellow to orange tones, water deeply before freeze-up when soil is dry and collect heavily spotted foliage. In winter, direct salt-laden snow elsewhere and protect a young trunk from rodents without tightening the guard. For a temporary container, insulate the root ball and limit freeze-thaw cycles. After storms, have major cracks assessed by a certified arborist. Record irrigation, colour and scorch dates so exposure can be refined as nearby structures and plants change. Check each year that mulch, stakes and neighbouring plants do not press against the trunk or low branches. Test irrigation depth beneath the mulch, and remove only clearly dead wood after live growth has fully expanded. Record observations after major storms.
Container growing
A garden,within reach.
Recommended pot size
Container at least 60 cm wide and deep, enlarged as needed, with unobstructed drainage holes
Possible temporarily in a large, very well-drained container with winter root protection; sheltered in-ground planting preferred long term
Bloom and dimensions
Its place,in your garden.
Mature height
3 to 4 m (10 to 13 feet)
Width / spread
3 m (10 feet)
Flower color
Crimson, in upright clusters
Foliage color
Bright yellow to yellow-green in spring and summer; potentially golden yellow to orange in autumn
Foliage type
Deciduous
Growth rate
Slow to moderate, approximately 15 to 30 cm per year
Growth habit
Broadly upright, multibranched, with angular branching
Bloom period
Crimson flowers appear in spring in small upright clusters above the yellow foliage. They are modest in size, but their colour and position create an interesting contrast. After pollination they produce nearly horizontal winged samaras that mature above the leaves. Avoid non-targeted insecticides during bloom and note late frost, which can reduce flowers or fruit for one season. Flowering and fruiting also vary with specimen maturity and local exposure.
Fruiting
Winged samaras held in upright clusters above the foliage follow the flowers. Their wings are nearly horizontal and their effect remains secondary beside yellow leaves. Quantity varies with maturity, pollination and late frost. Seedlings do not reproduce the grafted Aureum cultivar faithfully and must not carry its name. Remove misplaced volunteers while young before they compete with roots. Fruit colour and abundance should not be used as the main cultivar-identification feature.
Garden associations
In goodcompany.
Companion plants
Pair Aureum with green or blue-green conifers, ferns, sedges, foamflowers, coral bells, bush honeysuckles and native perennials suited to fresh, drained soil. Their dark or textured foliage emphasizes luminous yellow without competing with the focal point. Establish them toward the future crown perimeter without cutting roots, covering the flare or trapping low branches. Avoid invasive groundcovers and large yellow plants that would dilute contrast. Preserve open access for deep irrigation and graft-union inspection. Match moisture needs so companions do not force drought or saturation around the maple.
Frequently asked questions
Your questions,answered.
Why do Aureum leaves become greener?
Aureum expresses brighter yellow in sufficient light, but leaves naturally become more yellow-green in shade. This variation does not mean the cultivar has changed. Conversely, intense hot sun can scorch margins instead of improving colour. Choose bright partial shade, filtered light or gentle morning sun. Keep soil evenly moist and compare several branches because outer and inner foliage receive different light levels. Colour also changes with leaf age and season. Do not add fertilizer simply to force stronger yellow without testing the soil. Adjust exposure gradually and record recurring scorch before considering relocation of an established tree. Healthy new growth confirms that conditions are suitable.
How large does Aureum golden full moon maple become?
Iseli lists a garden size near 3 m high by 2.1 m wide, useful for visualizing a still relatively young specimen. Long-term references nevertheless show that an old plant can reach 5 to 6 m in height and similar spread. Growth of 15 to 30 cm per year is slow but continues for decades. The 6-, 10-, 15- and 20-gallon formats describe sale size only. Reserve a genuine mature crown away from walls and narrow passages rather than trying to contain the tree through annual shearing that would destroy its natural form. Mature potential should guide placement from the beginning.
Can Aureum grow in a container in Canada?
Yes, temporarily in a container at least 60 cm wide and deep with generous drainage holes. Use an aerated medium, keep the root flare visible and water when the upper layer begins to dry. Container roots are far more exposed to cold, wind and freeze-thaw cycles than roots in the ground. Before winter, move the pot to a sheltered location and insulate the root ball without trapping water. Do not bring the dormant tree into a warm room. Because an old specimen may reach 5 to 6 m, sheltered in-ground planting remains the most reliable long-term solution in Canadian Zone 5. Increase container size before roots circle densely.
Why do Aureum leaves develop brown margins?
Margins may brown when afternoon sun is too intense, wind dries foliage, the root ball lacks water or salts reach the roots. First check moisture beneath mulch and drainage, because saturated soil can damage roots and produce drought-like symptoms. Observe several branches, exposure and the timing of symptoms. Water deeply when needed, direct salt-laden snow elsewhere and provide light protection from scorching sun without enclosing the crown. If dieback progresses, look for spots, cankers or Verticillium symptoms and obtain a diagnosis before treatment. Do not apply fertilizer simply because leaf edges are brown, as excess salts can make the problem worse.
How should Aureum maple be pruned?
Respect its broadly upright, bushy and rounded habit. After leaves expand, remove only dead, broken, diseased or crossing wood and any shoot arising from the rootstock. Use clean tools and cut just outside the branch collar without leaving a stub. Never top the crown, shear it into a ball or try to hold the tree at its sale-container size. Correct planting distance reduces future cuts. Hire a certified arborist for a large branch, crack or elevated work. Clean tools between cuts when disease is suspected and obtain a diagnosis first. Minimal pruning preserves both the winter framework and the naturally layered foliage display.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Small spring flowers may support some insects and the crown can provide occasional shelter. Samaras may also offer food, but this Japanese species is not native in Canada. Add diverse regional flowering and fruiting plants, avoid non-targeted pesticides during bloom and maintain a layered garden rather than presenting the maple as a major habitat source. Native companions provide stronger long-term ecological value while preserving the ornamental focal point.