🌸 Cornus kousa ‘Summer Fun’ – Summer Fun Variegated Japanese Dogwood

🔎 Identification

Scientific name: Cornus kousa ‘Summer Fun’.

Family: Cornaceae (dogwood family).

Common names: Variegated Japanese dogwood, Summer Fun dogwood, kousa dogwood.

Species origin: Japan, Korea and China.

Cultivar origin: American horticultural selection discovered by Talon Buchholz of Buchholz Nursery, Oregon.

Type: Small deciduous ornamental tree.

Special feature: Remarkable for greyish-green foliage edged in creamy white, pink-tinged young leaves, and pink and orange-red fall colours.

🌿 Botanical description

Habit: Upright, rounded to broadly spreading, sometimes vase-shaped.

Height: About 4.5 to 5.5 m, sometimes up to 6 m.

Spread: About 3.5 to 4.5 m, depending on conditions.

Growth: Moderate to fairly vigorous for a variegated dogwood.

Trunk: Generally short, with tiered branching.

Branches: Spread horizontally, gradually forming a rounded silhouette.

Leaves:

• Simple and opposite.

• Oval to elliptical.

• Wavy margins.

• Greyish-green to medium-green centre.

• Broad, luminous creamy-white margins.

• Young leaves often tinged pink in spring.

• Pink, orange and red in fall.

• Especially ornamental foliage even outside flowering.

Special feature: Particularly broad, contrasting white margins distinguish it from several other variegated dogwoods.

🌸 Flowering

Period: May to June, sometimes into early July, depending on the climate.

Flowers:

• Small, greenish to yellowish true flowers.

• Grouped in the centre of a flower head.

• Surrounded by four large white bracts.

• Bracts pointed and slightly overlapping.

• Can reach about 5 to 8 cm across.

Colour: Pure to creamy white.

Duration: Several weeks in favourable conditions.

Special feature: Young bracts may show green shades or slight variegation before turning white at maturity.

Unlike Cornus florida, Cornus kousa flowers after its foliage emerges.

🍓 Fruit

Type: Spherical, fleshy fruit resembling small raspberries.

Size: About 2 to 3 cm across.

Colour: Red to pinkish red when ripe.

Ripening period: August to September, sometimes October.

Features:

• Fruit hangs from long stalks.

• Bumpy, slightly granular surface.

• Highly ornamental.

• Appreciated by birds.

• May fall to the ground when ripe.

Edibility: Edible, with mild, slightly sweet, sometimes mealy pulp.

Uses: Fresh eating, jams and cooking.

🍂 Fall colour

Period: September to October.

Colours:

• Soft pink.

• Raspberry pink.

• Coppery orange.

• Scarlet red.

Special feature: Broad white leaf margins gradually become pink, then orange-red. The green centre also darkens, creating especially appealing contrast.

🌱 Growing conditions

Exposure: Sun to partial shade.

Soil: Rich, humus-rich, fertile and well drained.

Texture: Prefers loam but tolerates clay and sand if drainage is adequate.

pH: Slightly acidic to neutral, but tolerates different pH levels.

Moisture: Prefers cool, consistently moist soil.

Watering: Regular during the first few years and droughts.

Planting: Spring or fall.

Spacing: Allow about 4 to 5 m for natural development.

Location: Morning sun and light afternoon shade in hot regions.

Special feature: Unlike some variegated cultivars, ‘Summer Fun’ tolerates sun well. Light shade during intense heat can nevertheless help preserve foliage quality.

❄️ Hardiness

Zones: 5 to 8.

Approximate minimum temperature: About -23 to -26 °C, depending on growing conditions and establishment.

Winter resistance:

• Good hardiness for a variegated dogwood.

• Suited to cool temperate regions.

• Young trees benefit from protection during their first winters.

• Young shoots may be sensitive to late frosts.

Special feature: Hardiness is comparable to several other Cornus kousa cultivars. Generally more resistant to anthracnose than Cornus florida.

✂️ Care

Pruning: Generally unnecessary. Retain its natural habit and tiered branches.

Pruning period: After flowering or in late winter to remove dead and damaged branches.

Fertilizing: Well-rotted compost in spring, if needed.

Mulching: Recommended to keep soil moist and protect shallow roots.

Watering: Monitor especially during hot, dry weather.

Propagation: Mainly by semi-hardwood cuttings or grafting to retain cultivar characteristics.

Transplanting: Prefer young trees, since dogwoods can be sensitive to root disturbance.

Diseases and pests:

• Dogwood anthracnose.

• Powdery mildew.

• Leaf spots.

• Scale insects.

• Root rot in waterlogged soil.

Special feature: Good air circulation and well-drained soil help limit health problems.

🦋 Ecological value

• Small central flowers may attract pollinating insects.

• Fruit feeds birds.

• Dense foliage shelters small wildlife.

• Fruit supports biodiversity.

• Can be included in natural or ornamental gardens.

✅ Highlights

• Beautiful green and creamy-white variegated foliage.

• Young leaves tinged pink in spring.

• Large white floral bracts.

• Ornamental foliage throughout summer.

• Pink, orange and red fall colours.

• Edible red fruit.

• Elegant, relatively compact habit.

• Good hardiness for a variegated dogwood.

• Ornamental interest across several seasons.

• More vigorous than some other variegated cultivars.

❌ Points to consider

• Relatively slow to moderate growth.

• Needs sufficiently moist soil.

• Sensitive to prolonged drought.

• Avoid constantly waterlogged soil.

• Fallen fruit can soil surfaces.

• White margins may brown under water stress or excessive heat.

• Can be affected by anthracnose and powdery mildew.

• Needs sufficient room for crown development.

🌳 Distinctive feature: ‘Summer Fun’ is especially appealing for exceptional variegated foliage. Broad creamy-white borders make every leaf look delicately hand-painted. In spring, pinkish young leaves accompany white flowers; in fall, the tree becomes a composition of pink, orange and red.