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PlantSnap
Plant Care
Sweet william
(Dianthus barbatus)
Also Known As
Sweet william, China pink, Cottage pink
About This Plant
Dianthus barbatus is a species of flowering plant in the family Caryophyllaceae, native to southern Europe and parts of Asia. It is a herbaceous biennial or short-lived perennial plant growing to 30–75 cm tall. The leaves are opposite, simple, linear to oval, up to 8 cm long.
Plant Care Instructions
Outdoor Size Range
18-24 inches (45-60 cm)
Light Requirements
Dianthus barbatus requires full sun to grow and bloom properly. It needs at least 6 hours of direct sunlight per day.
Humidity Needs
Dianthus barbatus prefers moderate humidity levels of around 40-60%. It can tolerate dry air, but high humidity is beneficial for the plant.
Fertilizing Schedule
Fertilize Dianthus barbatus with a balanced fertilizer once a month during the growing season. Use a fertilizer with equal amounts of nitrogen, phosphorus, and potassium.
Pruning Guidelines
Deadhead spent blooms regularly to encourage more flowers to grow. Cut back the entire plant by one-third after it has finished blooming to promote bushier growth.
Common Pests and Diseases
Dianthus barbatus is relatively pest-free, but it can be susceptible to aphids, spider mites, and thrips. Treat infestations with insecticidal soap or neem oil.
Indoor Size Range
12-18 inches (30-45 cm)
Watering Schedule
Water the plant deeply once a week. The soil should be moist but not soggy. Avoid overwatering as it can cause root rot.
Temperature Range
Dianthus barbatus can tolerate a wide range of temperatures. It grows best in temperatures between 60-75°F (15-24°C). It can survive temperatures as low as 20°F (-7°C) and as high as 90°F (32°C).
Growing Season
Dianthus barbatus blooms from late spring to early summer. It is a biennial plant, which means it completes its life cycle in two years.
Growing Difficulty Level
Dianthus barbatus is easy to grow and care for. It is a good choice for beginner gardeners.
USDA Hardiness Zones
Dianthus barbatus is hardy in USDA zones 3-9.
Did You Know?
The common name 'Sweet William' is said to be named after William Shakespeare, who often wrote about flowers in his plays.
