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Small ornamental deciduous hybrid tree
Sapindaceae
Hardy hybrid maple with red fall colour
Northern Glow® maple
Acer pseudosieboldianum × Acer palmatum ‘Hasselkus’
Northern Glow® is the ‘Hasselkus’ hybrid maple developed in Wisconsin from Korean and Japanese maple parents. Zone 4 hardiness brings refined foliage to many cold Canadian communities. Leaves emerge bronze, mature to green in summer and move from bright orange-red to deep red in autumn. The initially upright form broadens with age and reaches approximately 6.1 m in height and 7.3 m in spread. Plant it in filtered sun or partial shade and organic-rich, evenly moist, well-drained soil. Protect the tree from drying winds, road salt and intense late-day sun. Reserve its substantial mature width from the beginning. A Northern Glow maple is especially effective where the spreading crown can be seen against a simple background. Northern Glow Korean maple is a common retail search name, although the plant is a documented interspecific hybrid.
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Planting essentials
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Discover the plant
Common nameNorthern Glow® hybrid maple
FamilySapindaceae
GenusAcer
Speciespseudosieboldianum × palmatum
CultivarHasselkus (Northern Glow®)
TypeSmall ornamental deciduous hybrid tree
Botanical nameAcer pseudosieboldianum × Acer palmatum ‘Hasselkus’
Northern Glow® maple (Acer pseudosieboldianum × Acer palmatum ‘Hasselkus’) is the hybrid developed in Madison, Wisconsin, by Professor Ed Hasselkus from seed of a Korean maple pollinated by a Japanese maple. The ‘Hasselkus’ selection combines Korean-maple hardiness with refined Japanese-maple foliage. Palmate leaves emerge bronze, mature to green in summer and shift from bright orange-red to deep red in autumn. The young tree is upright, then the crown broadens gracefully with age. Allow approximately 6.1 m in height and 7.3 m in spread at maturity. Northern Glow® is rated Zone 4, extending an Asian-maple aesthetic into colder Canadian landscapes.
Across Canada, grow Northern Glow® in filtered sun or partial shade, ideally east of a building or hedge that reduces prevailing winds. It tolerates full sun when roots remain cool, but hot, dry and reflective sites increase leaf scorch. Choose fertile, organic-rich, evenly moist, well-drained soil with a slightly acidic to neutral reaction. Water deeply through the first two growing seasons, prolonged drought and a dry autumn before freeze-up. Keep the root flare and graft union visible, then spread 5 to 8 cm of mulch without touching the trunk. Avoid road salt, compaction, waterlogged soil and excessive nitrogen.
Use Northern Glow® as a specimen in a residential yard, near a patio, within a Japanese-inspired garden or at the edge of a large layered bed. Reserve mature width from the beginning and keep the crown clear of wires, walls, foundations and paving. Minute flowers emerge with the foliage in spring and may be followed by samaras. A mature crown can provide perches or nesting locations, but this non-indigenous hybrid has limited ecological value; combine it with regionally native plants. Remove only dead, damaged or crossing wood. Avoid shearing and topping so the natural transition from upright youth to a broadly spreading mature silhouette remains intact.
In the garden
- Exposure
- Filtered sun to partial shade; full sun only with fresh soil and protection from dry wind
- Life cycle
- Vivace ligneuse
Planting guide
Planting & propagation
Growing method
Plantez Érable Northern Glow® au printemps ou au début de l’automne, lorsque le sol se travaille facilement et que vous pouvez assurer l’arrosage. Réservez d’abord l’espace nécessaire à la couronne et aux racines adultes; la petite taille du plant acheté ne détermine pas l’espacement définitif. Vérifiez le drainage avant de creuser et gardez la motte humide pendant la préparation. Repérez les premières grosses racines près du tronc et utilisez ce collet, plutôt que le dessus du terreau meuble, pour déterminer la profondeur de plantation. Creusez une fosse plus large que la motte sans enfouir le tronc. Retirez le contenant et examinez les racines qui tournent; demandez conseil à la pépinière si elles sont fortement déformées. Déposez l’arbre bien droit sur une assise ferme, remblayez surtout avec la terre extraite et arrosez lentement pour stabiliser le sol. Étendez un paillis organique en dégageant l’écorce et le collet. Contrôlez l’humidité dans la motte originale et dans le sol voisin, car ils peuvent sécher différemment. Utilisez des tuteurs seulement si l’arbre manque de stabilité, avec des attaches larges inspectées régulièrement. Durant la première saison, protégez le tronc des appareils de tonte et adaptez l’arrosage à la chaleur, au vent et aux périodes sèches. Au Québec, terminez la plantation automnale assez tôt pour surveiller l’établissement avant le gel du sol. Choisissez soleil et un sol humide et bien drainé. Vérifiez l’humidité pendant l’établissement et gardez le collet visible. Cet hybride d’érables coréen et japonais ne reçoit pas la zone de rusticité de l’un ou l’autre parent.
Soil and care
Soil & care
Watering
Water slowly and deeply after planting, then keep the root ball and surrounding soil evenly moist through the first two growing seasons. Check moisture beneath mulch before watering again. During prolonged drought, soak the developing root zone before leaves wilt or brown. Avoid small daily applications beside the trunk, standing water and systems that keep bark continually wet. Expand the irrigated area as roots extend beyond the original planting hole.
Soil type
Choose fertile, organic-rich, evenly moist and well-drained soil. Slightly acidic to neutral loam supports root establishment and consistent colour. Loosen a broad area without burying the root flare and correct drainage before planting. Avoid continually waterlogged clay, rapidly drying sand, compacted fill and small pits surrounded by paving because root stress promotes leaf scorch and dieback. Preserve an uncompacted zone beyond the original planting hole as the tree grows.
Fertilization
In fertile soil, organic mulch and a thin surface layer of mature compost are generally sufficient. If growth appears weak, test the soil before applying a labelled tree fertilizer. Avoid heavy nitrogen, products placed against the trunk and late-season feeding, which can extend soft growth before winter. Steady growth creates a stronger framework than forced growth and reduces unnecessary maintenance. Correct moisture and drainage before assuming that fertilizer will solve pale or limited growth.
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. Compare bud break across several branches before declaring winter injury. In summer, check moisture, drainage and compaction whenever leaf margins brown; young foliage can also be damaged by dry wind and intense sun. Watch for aphids, scale insects, leaf spots and Verticillium symptoms, then obtain a diagnosis before treating. Prune after leaves expand or during dormancy to remove only dead, broken, diseased or crossing wood. In autumn, water deeply before freeze-up when soil is dry and collect heavily spotted leaves. In winter, keep salt-laden snow outside the root zone and protect a young trunk from rodents without binding the guard. Clean tools between trees, never top the crown and have major cracks assessed by a qualified arborist. Reassess clearance from buildings, wires and paving periodically. Record heat, irrigation and damage events to separate site stress from recurring pest or disease problems. After storms, look for split branches, torn unions and damaged ties. Remove winter guards before heat builds and keep mowers outside the mulch ring. During drought, direct water across the full developing root zone rather than applying small amounts at the trunk. Inspect leaves from several parts of the crown before diagnosing a disorder. Check drainage during snowmelt and protect soil from construction traffic. If repeated scorch occurs, review afternoon exposure, wind and rooting volume before applying products. Replace damaged guards promptly but never fasten them tightly around expanding bark.
Container growing
Container growing
Un arbre vendu en contenant n’est pas automatiquement adapté à une culture permanente sur la terrasse. Pour Érable Northern Glow®, prévoyez La référence de pépinière NVK indique 5–6 m (16–20 pi) de hauteur et 6–7 m (20–23 pi) de largeur. Cette référence ne précise pas l’âge. Cet hybride d’érables coréen et japonais ne reçoit pas la zone de rusticité de l’un ou l’autre parent. Utilisez une position temporaire seulement si le drainage, la stabilité et l’arrosage peuvent être surveillés. Choisissez soleil et un sol humide et bien drainé. Vérifiez l’humidité pendant l’établissement et gardez le collet visible. Le contenant doit convenir à la motte réelle et rester stable pendant le développement de la couronne. Utilisez des trous de drainage libres et un terreau adapté aux plantes ligneuses de pépinière. Ne supposez pas que la pluie tombée sur la terrasse voisine a atteint les racines sous les feuilles. Les racines d’un arbre en pot exposé demandent un plan d’hivernage distinct de la rusticité du même arbre en pleine terre. Examinez le système racinaire et réévaluez l’espace disponible pendant la croissance. Prévoyez une installation ultérieure au jardin lorsque l’arbre dépasse la capacité du contenant.
Bloom and dimensions
Size, flowering & harvest
Mature height
Approximately 6.1 m (20 ft)
Width / spread
Approximately 7.3 m (24 ft)
Foliage color
Bronze at emergence, green in summer; bright orange-red to deep red in autumn
Foliage type
Deciduous
Growth habit
Upright when young, becoming broadly spreading and graceful with age
Garden associations
Companion plants & uses
Companion plants
Pair Northern Glow® with dwarf conifers, dogwoods, serviceberries, viburnums, ferns, hostas, Canada wild ginger and Solomon’s seal that enjoy fresh, well-drained soil. Regionally native shrubs suited to the site add flowers, fruit and cover. Establish companions toward the future crown perimeter without cutting roots or covering the flare. Keep a broad mulch ring open for inspection and watering. Avoid invasive groundcovers, frequent digging and large competing trees positioned too close. Similar moisture requirements simplify long-term care as shade increases beneath the broad crown.
Garden use
Use Northern Glow® as a specimen, accent near a patio, principal crown in a Japanese-inspired garden or dominant feature above a large layered bed. Reserve approximately 6.1 by 7.3 m and keep branches clear of wires, buildings, paving and other trees. A broad mulch ring protects shallow roots. Pair it with low plants able to tolerate increasing shade without cultivation beneath the crown. The site must allow the form to broaden naturally without shearing or topping. Preserve access to the root flare and graft union for inspection.
Frequently asked questions
Frequently asked questions
Is Northern Glow® a pure Korean maple?
No. Northern Glow® is the trade name for the ‘Hasselkus’ hybrid between Korean maple, Acer pseudosieboldianum, and Japanese maple, Acer palmatum. Professor Ed Hasselkus developed it in Madison, Wisconsin, from seed of the Korean parent. This origin explains Zone 4 hardiness and foliage that more closely resembles the Japanese parent. A label showing only Acer pseudosieboldianum ‘Northern Glow’ therefore oversimplifies the identity. Use the complete hybrid name and ‘Hasselkus’ cultivar when selecting, comparing or caring for the plant. Seedlings produced from samaras will not reproduce this named cultivar faithfully and should not be sold under the same name. This distinction prevents inaccurate expectations about mature size, form and hardiness.
How large does Northern Glow® maple grow?
Northern Glow® reaches approximately 6.1 m in height and 7.3 m in spread at maturity, or about 20 by 24 ft. It is upright while young, then the crown becomes broadly spreading and eventually wider than tall. Growth is generally slow to moderate, near 30 cm per year depending on the site. Measure clearance from the trunk centre and keep buildings, wires, utilities, paving and other trees away. The young sale plant will continue broadening for many years. Correct placement allows the natural form to develop without topping or large future cuts. Climate, soil quality and growing-season length affect how quickly mature dimensions are reached.
Is Northern Glow® hardy enough for Canadian winters?
Northern Glow® is rated Zone 4 by J. Frank Schmidt. It suits many populated Canadian communities when the local zone and microclimate meet that requirement. Choose shelter from prevailing winds, avoid low areas that collect water and stop late nitrogen applications so shoots mature before winter. Water deeply before freeze-up when autumn is dry and keep salt-laden snow away from roots. In a zone colder than 4 or an exposed wind corridor, injury becomes more likely. Confirm the site’s current Canadian hardiness zone and consider wind, snow cover, drainage and frost pockets before planting. Local nursery experience can help interpret a borderline location accurately.
Does Northern Glow® prefer full sun or partial shade?
Northern Glow® accepts full sun to partial shade, but filtered light or morning sun with light late-day shade reduces scorch. A position east of a building or hedge also protects against prevailing winds. Full sun can work when roots have access to fresh, deep, mulched soil, although paving, drought and reflected heat increase stress. Very dense shade can reduce vigour and autumn colour. Observe actual hours of sun, protect a broad root zone and water deeply through establishment instead of frequently wetting only the trunk. Exposure should be considered together with wind, soil volume, drainage and available irrigation rather than as an isolated factor.
How should Northern Glow® maple be pruned?
Allow Northern Glow® to move naturally from an upright young form to a broadly spreading crown. Remove dead, broken or diseased wood, a crossing branch and a weak union before it becomes large. Avoid shearing, topping and repeated cuts intended to contain a tree planted too close to a structure. Maples can bleed heavily in spring, so work after leaves expand or during dormancy in dry weather with clean tools. Remove only a small portion of the crown at one time. Consult a qualified arborist before a large cut or when a crack affects a main scaffold. Correct placement remains the most effective long-term pruning strategy.
Outils
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