Not the plant you're looking for? Search over 300,000 plants

Annual BiennialBedding

Dianthus barbatus Super Duplex Mixed (p,a/d)

sweet william [Super Duplex Mixed]

A bushy, short-lived perennial, usually grown as a biennial to flower in spring and summer, with green leaves. A mixture of sweetly-scented clusters of double flowers, ranging in colour from bright and pastel pinks to reds and white appear in spring and summer. A lovely traditional plant for growing in the border or for cutting and enjoying in a vase

Save to My plants

Buy this plant

Plant nurseries
1 suppliers

Ultimate height

0.1–0.5 metres

Time to ultimate height

1–2 years

Ultimate spread

0.1–0.5 metres

Loam

Sand

Moisture

Well–drained

pH

Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

East–facing or South–facing or West–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)

Botanical details

Family: Caryophyllaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Humans/Pets: Skin allergen, wear gloves and other protective equipment when handling. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Dianthus can be annuals, evergreen perennials or subshrubs with narrow, often greyish leaves and showy flowers that are frequently fragrant
Name status: Trade

How to grow

Cultivation

Grow in a well-drained neutral to slightly acid soil in full sun

Propagation

Propagate by seed sown in late spring and plant out into flowering positions in the autumn

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Bedding
Cut flowers
Flower borders and beds
Underplanting of roses and shrubs

Pruning

Deadhead as required

Pests

May be susceptible to slugs and aphids

Diseases

May be susceptible to powdery mildews, a rust, a virus and fusarium wilt

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.