Vaccinium corymbosum 'Duke' (F)

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blueberry 'Duke'

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Synonyms

Vaccinium 'Duke'

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Shrubs
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A bushy upright deciduous shrub to 2m tall, with small oval leaves turning red and yellow in autumn, and cylindrical creamy-white flowers followed by blue-bloomed, edible fruits ripening in mid to late summer

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1-1.5 metres
Max Height
1.5-2.5 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained
pH
Acid

Position

Full sun Partial shade
Aspect
West–facing or South–facing or East–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ericaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Vaccinium can be evergreen or deciduous shrubs or small trees, with simple leaves and small, bell- or urn-shaped flowers followed by juicy, sometimes edible berries
Name Status
Accepted
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea

This genus produces fruit, but not necessarily edible fruit

How to Grow

Cultivation

Plant in a sheltered site in well-drained, moisture-retentive, acidic soil, (pH 4.5-5.5) in sun or part shade. Alternatively grow in containers or raised beds filled with peat-free, ericaceous compost . Pot grown plants benefit from winter protection. For optimal pollination and yield plant three different cultivars. See blueberry cultivation for further advice

Propagation

Take 10-15cm (4-6in) softwood cuttings in late spring or semi-ripe cuttings in early summer

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • City and courtyard gardens
  • Patio and container plants
  • Wildlife gardens
  • Flower borders and beds
  • Edible fruit

Pruning

More mature plants benefit from regular pruning, see pruning blueberries

Pests

May be susceptible to vine weevil, especially if container grown

Diseases

May be susceptible to honey fungus (rarely), powdery mildews, root rot and chlorosis due to iron and manganese deficiency; see nutrient deficiencies