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Herbaceous Perennial

Dahlia Happy Single Princess ('HS Princess'PBR) (Happy Single Series) (Sin)
  • RHS AGM

dahlia [Happy Single Princess]

A compact herbaceous perennial, to 80cm high, with leaves so dark they are almost black. Single flowers, 5cm across, with eight white rays, tinged with pink, and a golden yellow central disc, in summer and autumn

Synonyms
Dahlia 'HS Princess'PBR
© RHS
© RHS
© RHS
© RHS
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Size
Ultimate height
0.5–1 metres
Time to ultimate height
1–2 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Black Green
Summer White Pink Yellow Black Green
Autumn White Pink Yellow Black Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Asteraceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Genus

Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flowerheads, double in many cultivars, in summer and autumn

Name status

Trade

Horticultural Group
Single-flowered dahlias have flowerheads usually less than 10cm across, with one or two rows of spreading ray florets, surrounding a central boss of small tubular disc florets which are valuable for bees and butterflies

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How to grow

Cultivation

Grow in fertile, humus-rich, well-drained soil, enriched with organic matter, in full sun; lift and store tubers in autumn to replant or use as a source of cuttings in spring; poor flowering may be caused by overfeeding with high nitrogen fertilisers, not enough direct sunshine or not enough moisture at the roots; for more advice, see dahlia cultivation

Propagation

Propagate by softwood cuttings taken in spring from shoots from stored tubers, or divide the tubers, ensuring that each division has a viable bud

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds
  • Bedding
Pruning

Deadhead to prolong flowering; cut back to near ground level in the autumn, before lifting and storing for the winter

Pests

May be susceptible to aphids, capsid bug, earwigs, caterpillars, slugs and glasshouse red spider mite

Diseases

May be affected by powdery mildews, dahlia mosaic virus, cucumber mosaic virus, tomato spotted wilt virus, storage rots, and leafy gall

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.