🌸 Cornus × ‘KN30-8’ VENUS® – Venus Hybrid Dogwood

🔎 Identification

Scientific name: Cornus × ‘KN30-8’, also marketed as Venus®.

Botanical synonym: Cornus × elwinortonii ‘KN30-8’.

Family: Cornaceae (dogwood family).

Common names: Venus hybrid dogwood, Venus dogwood, hybrid dogwood.

Parent species' origins: Cornus kousa (China, Japan and Korea) and Cornus nuttallii (western North America).

Cultivar origin: Horticultural selection from a breeding programme at Rutgers University, New Jersey, United States.

Type: Deciduous ornamental tree.

Special feature: An exceptional hybrid known for some of the largest floral bracts among dogwoods. It combines extremely abundant flowering, glossy dark green foliage and good resistance to several major Cornus diseases.

🌿 Botanical description

Habit: Upright, oval to broadly rounded, with a relatively spreading crown.

Height: About 6 to 7.5 m at maturity, sometimes more depending on conditions.

Spread: About 5 to 6 m, potentially approaching 7 m over time.

Growth: Moderate to fast. Considered particularly vigorous for a hybrid dogwood.

Trunk: Generally straight, sometimes branching fairly low.

Branches: Spreading and relatively horizontal, gradually forming a dense crown.

Leaves:

• Simple and opposite.

• Oval to elliptical.

• Slightly pointed tips.

• Generally entire, slightly wavy margins.

• Dark to deep green in summer.

• Relatively thick texture.

• Slightly glossy surface.

• Clearly visible veins.

• Red, reddish-purple and sometimes orange in fall.

Special feature: Dense, dark foliage creates a beautiful backdrop for enormous white bracts. Its vigour and good tolerance of certain diseases distinguish it from several more sensitive ornamental dogwoods.

🌸 Flowering

Period: May to June, depending on climate and region. Flowering may be earlier where spring is mild.

Flowers:

• Small, greenish to yellowish true flowers.

• Grouped in the centre of a dense flower head.

• Surrounded by four large white bracts.

• Bracts broad, oval to slightly pointed.

• The whole flower head can reach about 15 to 20 cm across.

• Initially creamy white to slightly greenish white.

• May develop a slight pink tinge with age.

Colour: Creamy to pure white.

Duration: Several weeks, depending on weather conditions.

Special feature: Floral bracts are exceptionally large, reaching about 15 cm across or more in suitable conditions. In full bloom, the tree can look entirely covered with large white flowers.

Unlike many other dogwoods, Venus® flowers particularly abundantly, creating a spectacular spring effect.

🍓 Fruit

Type: Small, fleshy fruit resembling raspberries or small strawberries.

Size: About 1.5 to 2 cm.

Colour: Orange-red when ripe.

Ripening period: Late summer to fall.

Features:

• Generally spherical fruit.

• Slightly bumpy surface.

• Borne on small stalks.

• May resemble Cornus kousa fruit.

• Sparse because of this hybrid's low fertility.

Edibility: The horticultural documentation consulted does not confirm a specific food use for this cultivar. It is best considered an ornamental tree rather than a fruit tree.

Ecological value: The few fruit produced may help feed wildlife, especially birds.

Special feature: Venus® is considered nearly sterile, generally producing far less fruit than many other dogwoods.

🍂 Fall colour

Period: September to October, depending on the climate.

Colours:

• Scarlet red.

• Orange-red.

• Reddish purple.

• Deep purple.

Special feature: Dark green foliage gradually turns a particularly ornamental red to reddish purple. This fall transformation adds a second period of visual interest after spectacular spring flowering.

🌱 Growing conditions

Exposure: Sun to partial shade.

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

Texture: Prefers loamy soil rich in organic matter.

pH: Slightly acidic to neutral. Avoid strongly alkaline soil.

Moisture: Prefers cool, consistently moist soil.

Watering: Regular during the first few years and prolonged droughts.

Planting: Spring or fall.

Spacing: Allow about 5 to 7 m for natural crown development.

Location: Choose a bright spot with moist soil, sheltered from drying winds.

Special feature: Venus® tolerates certain environmental conditions well thanks to its Cornus kousa heritage. It nevertheless prefers moist, slightly acidic, well-drained soil. Extremely hot exposures and alkaline soils can compromise growth.

❄️ Hardiness

Zone: 5b according to several horticultural references. Some sources indicate zone 5.

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

Winter resistance:

• Good hardiness for a hybrid dogwood with very large flowers.

• Suited to cool temperate regions.

• Young trees benefit from protection during their first winters.

• Drying winter winds can damage young shoots.

• Late frosts can affect flower buds and bracts.

Special feature: Zone 5b hardiness makes it of interest in several parts of Quebec. Where winters are particularly harsh, choose a protected location and encourage good root establishment before the first severe cold.

✂️ Care

Pruning: Generally unnecessary. Retain its natural habit and branch structure.

Pruning period: After flowering or in late winter, to remove dead, broken or poorly positioned 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 grafting or other horticultural methods of vegetative propagation to retain cultivar characteristics.

Transplanting: Prefer young trees and avoid significant root disturbance.

Diseases and pests:

• Dogwood anthracnose.

• Powdery mildew.

• Leaf spots.

• Scale insects.

• Root rot in waterlogged soil.

• Water stress during prolonged drought.

Special feature: Venus® has better resistance than many dogwoods susceptible to anthracnose and powdery mildew. This is one of its main horticultural advantages, although it does not guarantee complete immunity.

🦋 Ecological value

• Small central flowers may attract pollinating insects.

• White bracts make flower heads particularly visible.

• The few fruit produced can feed birds.

• Dense foliage shelters small wildlife.

• Can be included in natural or ornamental gardens.

• Abundant flowering adds to the garden's floral diversity.

Special feature: Despite low fruit production, Venus® has ecological value during flowering, particularly for insects visiting its small central flowers.

✅ Highlights

• Spectacular, extremely abundant flowering.

• White bracts among the largest in the Cornus genus.

• Bracts can reach about 15 cm across.

• Glossy dark green foliage.

• Beautiful red to purple fall colours.

• Relatively vigorous growth.

• Elegant, naturally structured habit.

• Good resistance to dogwood anthracnose.

• Good resistance to powdery mildew.

• Noteworthy hardiness for cool temperate regions.

• Low fruit production limits problems from falling fruit.

• Excellent specimen tree for landscapes.

❌ Points to consider

• Needs sufficient room for crown development.

• Can become fairly wide at maturity.

• Prefers moist, well-drained soil.

• Prolonged drought can affect foliage.

• Avoid strongly alkaline soil.

• Young trees need special attention during their first winters.

• Late frosts can damage flowering.

• Disease resistance does not mean complete immunity.

• Fruit production is generally low.

• May be difficult to find in some nurseries because it is a specialized selection.

🌳 Distinctive feature: Venus® is an exceptional hybrid dogwood distinguished mainly by spectacularly large floral bracts. In spring, branches carry masses of large white structures reaching about 15 cm across, making the tree appear entirely covered in flowers. Dark green foliage beautifully highlights this display, then turns reddish purple in fall. Its outstanding flowering, vigorous growth and noteworthy resistance to major dogwood diseases make it one of the most impressive cultivars for gardens and landscapes.