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Native deciduous small fruiting tree
Rosaceae
Upright native small tree with flowers, edible fruit, and fall colour
Cumulus serviceberry
Amelanchier laevis ‘Cumulus’
Cumulus serviceberry is a native small tree selected for its upright oval habit, strong branches, and reduced suckering. Abundant white flowers appear early in spring and produce sweet edible fruit that changes from red-purple to purple-black and attracts birds. Coppery leaves become green before developing yellow-orange, orange-scarlet, and dark-red fall colour. Hardy to Zone 4, it reaches approximately 6 to 9 m high by 4.5 to 6 m wide (20 to 30 ft × 15 to 20 ft). It prefers full sun or partial shade and cool, slightly acidic to neutral, well-drained soil. Its vertical outline suits medium gardens and naturalized edible landscapes.
10 gallons; 12 gallons; 16 gallons
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- Quantity
- 10 gallons; 12 gallons; 16 gallons
- Exposure
- Full sun to partial shade; best bloom and fall colour in full sun
- Hardiness
- Zone 4
Discover the plant
Common nameCumulus serviceberry; Cumulus Allegheny serviceberry
FamilyRosaceae
GenusAmelanchier
Specieslaevis
CultivarCumulus
TypeNative deciduous small fruiting tree
Botanical nameAmelanchier laevis ‘Cumulus’
Cumulus serviceberry (Amelanchier laevis ‘Cumulus’) is a native small tree with an upright oval habit, selected for stronger branches and reduced suckering. In early spring, abundant white flowers appear before or as coppery leaves unfold. Small red-purple to purple-black fruit ripens in early summer; it is sweet, edible, and valued by birds. Green foliage turns yellow-orange, orange-scarlet, or dark red in fall. Hardy to Zone 4, the tree reaches approximately 6 to 9 m high by 4.5 to 6 m wide (20 to 30 ft × 15 to 20 ft). Smooth grey bark and a light branch structure add winter interest.
Plant ‘Cumulus’ in full sun or partial shade and cool, slightly acidic to neutral, well-drained soil. Even moisture supports flowering, fruiting, and growth, especially during the first two seasons. Dig a hole as deep as the root ball and twice as wide, keep the root flare level with the soil, and water thoroughly. Space trees 4.5 to 6 m (15 to 20 ft) apart. A 5 to 8 cm (2 to 3 in) organic mulch limits evaporation but should remain away from the trunk. Avoid stagnant water, prolonged drought, compaction, and repeated road-salt deposits.
Use ‘Cumulus’ as a small specimen tree, in a loose hedge, edible landscape, woodland edge, or bird-friendly planting. Its upright oval form suits places where a more vertical outline is useful. Harvest fruit when it becomes dark purple and soft, before wildlife takes it; enjoy it fresh or cooked. Prune lightly after flowering to preserve buds carried on the previous season’s wood. Watch for rust, powdery mildew, leaf spots, and especially fire blight. Good air circulation, clean pruning, and irrigation directed toward the soil help reduce problems. Stronger branches provide useful resistance to bending under wind, snow, and ice.
Planting guide
From planting to establishment.
Spacing / density
Space trees 4.5 to 6 m (15 to 20 ft) apart to allow crown development. In a loose hedge or naturalized screen, spacing of 3.5 to 4.5 m (12 to 15 ft) creates a closer grouping when good air circulation is preserved. Measure from the centre of each trunk and account for buildings, wires, and property boundaries.
Best planting time
In spring after the soil thaws, or in early fall at least six weeks before persistent frost
Propagation
Stem cuttings or grafting to preserve the ‘Cumulus’ cultivar faithfully; seed does not reproduce the variety identically
Soil and care
The right care,at the right time.
Soil pH
Slightly acidic to neutral, ideally approximately 5.0 to 7.0
Minimum temperature
Approximately -34 °C (-29 °F), Zone 4
Care level
Low to moderate
Drought tolerance
Yes
Watering
Water deeply once or twice weekly during the first season when rainfall is insufficient, then adjust frequency to weather and drainage. Soil should remain cool without becoming waterlogged. An established tree tolerates moderate drought, but irrigation during bloom, fruit development, and prolonged heat supports vigour. Direct water toward the root zone rather than foliage to limit disease. Check moisture beneath mulch before watering again.
Soil type
Cool, fertile, well-drained soil with loamy, sandy, or loosened clay texture is suitable. Slightly acidic to neutral conditions support vigour and nutrient availability. The tree adapts to several soils after establishment, but prolonged drought reduces fruiting and may scorch leaves. Stagnant water, severe compaction, and repeated salt deposits increase stress and disease risk. For best results, inspect soil, foliage, and growth regularly.
Fertilization
Fertilizer is generally unnecessary in fertile soil. In spring, spread a thin layer of mature compost over the root zone without touching the trunk. When a soil test identifies a deficiency, apply a balanced slow-release fertilizer according to its label. Avoid excess nitrogen because it encourages tender shoots, may reduce fruiting, and can increase susceptibility to fire blight. For best results, inspect soil, foliage, and growth regularly.
Moisture
Moderate and even; cool soil without stagnant water
Seasonal care
In spring, inspect bark and remove dead, crossing, or damaged branches before budbreak. White clusters appear early; avoid broad-spectrum insecticides during bloom to protect bees and butterflies. After flowering, prune only lightly because buds form on the previous season’s wood. In early summer, monitor ripening fruit and harvest when it becomes purple-black. Irrigate during dry periods to limit premature fruit drop. In summer, watch for rust, powdery mildew, leaf spots, or fire blight; remove affected shoots with disinfected tools and avoid wetting foliage. In fall, enjoy orange-red colour, renew mulch without piling it against the trunk, and water until freeze-up when soil remains dry. In winter, protect the trunk from rodents and avoid piling salt-laden snow over the root zone. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree.
Container growing
A garden,within reach.
Recommended pot size
At least 75 to 100 L (20 to 25 US gal) for temporary culture
Container culture is best limited to young trees for a temporary period. Use a stable pot holding at least 75 to 100 L (20 to 25 US gal) with numerous holes and a structured well-drained mix. Water regularly, protect the root ball from freeze-thaw cycles, and transplant into the ground before roots become strongly circling.
Bloom and dimensions
Its place,in your garden.
Mature height
8 m (26 ft)
Width / spread
6 m (20 feet)
Flower color
White
Foliage color
Coppery on emergence, green in summer, yellow-orange to orange-scarlet and dark red in fall
Foliage type
Deciduous; simple, oval, finely toothed, glossy leaves
Growth rate
Moderate
Growth habit
Upright, oval to broadly columnar, vigorous, and relatively low-suckering
Fragrance
Light floral fragrance
Bloom period
Numerous five-petalled white flowers open in slightly drooping clusters in early spring, before or as leaves unfold. Light fragrance and nectar attract bees, butterflies, and other pollinators. Bloom is generally more abundant in full sun. Protect flowers from insecticide sprays to support pollination and good fruit set. The white display contrasts with bronze-purple emerging foliage. For best results, inspect soil, foliage, and growth regularly.
Fruiting
Flowers produce small round pome fruits that change from red to purple-black in early summer. Sweet flesh resembles blueberries and can be eaten fresh or cooked. Birds harvest fruit quickly; netting installed after flowering can protect part of the crop. Seed does not reproduce the ‘Cumulus’ cultivar reliably, so vegetative propagation is required. For best results, inspect soil, foliage, and growth regularly.
Harvest
Harvest fruit in early summer when it is fully purple-black, soft, and sweet. Pick clusters by hand early in the morning and chill fruit promptly. It keeps for several days in the refrigerator or can be frozen in a single layer before transfer to a container. Leave part of the crop for birds to support local wildlife.
Garden associations
In goodcompany.
Companion plants
Pair ‘Cumulus’ with blueberries, hazelnuts, cranberries where soil suits them, viburnums, dogwoods, and small native conifers. Beneath the light crown, ferns, columbines, asters, wild strawberries, and sedges can form a lower layer. Choose plants that prefer cool well-drained soil and leave open space around the trunk. Avoid aggressive groundcovers that interfere with watering and inspection of the root flare. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree. For best results, inspect soil, foliage, and growth regularly.
Plants to avoid
Avoid stagnant water, severe compaction, prolonged drought, excess nitrogen, and repeated road-salt deposits. Rust, powdery mildew, leaf spots, cankers, and fire blight can occur. Encourage good air circulation, irrigate at soil level, and remove diseased shoots promptly with disinfected tools. Fruit may rot in very wet weather, and birds often consume the crop before full maturity. Use netting only when it cannot trap wildlife. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree.
Recipe idea
From the gardento your plate.
Edible parts
Ripe purple-black fruit, fresh or cooked; remove stems before preparation
For a simple compote, combine 500 ml (2 cups) of washed serviceberries with 30 to 45 ml (2 to 3 tbsp) maple syrup and 15 ml (1 tbsp) lemon juice. Simmer gently for 10 to 15 minutes, stirring until fruit bursts. Serve over yogurt, pancakes, or ice cream, or freeze in small portions.
Frequently asked questions
Your questions,answered.
How large does Cumulus serviceberry grow?
Cumulus serviceberry generally reaches approximately 6 to 9 m high by 4.5 to 6 m wide (20 to 30 ft × 15 to 20 ft). Its habit is upright, oval to broadly columnar, with a slender trunk, strong branches, and less suckering than many forms of the species. Allow at least 4.5 m (15 ft) between the trunk and a building, another large tree, or a boundary where the crown cannot extend. Avoid planting beneath overhead wires. In a loose hedge, spacing of 3.5 to 4.5 m (12 to 15 ft) works when good air circulation is maintained. For best results, inspect soil, foliage, and growth regularly.
Is ‘Cumulus’ serviceberry fruit edible?
Yes. Small ripe fruit changes from red to purple-black in early summer and has a sweet blueberry-like flavour. Eat it fresh, add it to muffins and pies, or make compote, preserves, and jelly. Harvest when fruit is fully dark, soft, and easy to detach. Birds value it highly and may empty the tree quickly; properly installed netting after flowering can protect part of the crop without interfering with pollinators. Wash fruit, remove stems, and refrigerate promptly. It also freezes well when first spread in a single layer. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree.
Are two serviceberry trees needed for fruit?
One ‘Cumulus’ serviceberry can produce fruit because serviceberries are generally self-fertile. Another compatible serviceberry nearby can increase pollen diversity and may improve crop size. Production depends mainly on abundant bloom, pollinator visits, even moisture, and avoiding severe frost during flowering. Place the tree in full sun to maximize bloom, avoid insecticides during this period, and irrigate when spring is dry. Birds harvest fruit rapidly, so an apparently empty tree does not necessarily mean that fruit failed to form. Watch clusters as they change from green to red and finally purple-black. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree.
When and how should ‘Cumulus’ serviceberry be pruned?
Prune lightly after flowering because some buds form on the previous season’s wood. First remove dead, broken, crossing, or diseased branches. Preserve the cultivar’s upright oval structure without shortening every shoot. For a single-trunk form, gradually remove low shoots without taking more than one-quarter of the crown in one year. Use clean tools and cut just outside the branch collar. When fire blight appears, remove affected wood during dry weather and disinfect tools between cuts. Avoid severe pruning that creates tender regrowth, weakens flowering, and distorts the naturally vertical crown. For best results, inspect soil, foliage, and growth regularly. This attention supports a healthy, productive, lasting tree.
Why are my serviceberry leaves spotted?
Orange spots may indicate rust, while a white coating suggests powdery mildew. Brown lesions or rapid blackening of young shoots can be associated with other diseases, including fire blight. Collect heavily affected leaves, prune diseased shoots with disinfected tools, and improve air circulation. Irrigate the soil rather than foliage and avoid excess nitrogen. Stress from drought, stagnant water, or salt can also cause brown margins. Identify the symptom and correct site conditions before applying a treatment. Consult a local horticultural specialist when dieback progresses, reaches major limbs, or returns despite sanitation and proper watering. For best results, inspect soil, foliage, and growth regularly.
Wildlife and pets
Life,around your plants.
Attracts birds
Yes
Native plant
Yes
Supporting wildlife
Flowers provide nectar and pollen for bees, butterflies, and other insects. Fruit feeds songbirds, grouse, and small mammals. Foliage hosts certain caterpillars, including viceroy and red-spotted purple butterflies. Leave part of the crop on the tree and avoid broad-spectrum insecticides during bloom. For best results, inspect soil, foliage, and growth regularly.