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Sweet William

Dianthus barbatus · Caryophyllaceae

The gardener's calendar

The right move for September

Ideal time to plant sweet william: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

JFMAMJJASOND Planting

ID card

Scientific name
Dianthus barbatus
Family
Caryophyllaceae
Plant type
Biennial or short-lived perennial herbaceous plant
Flowering
May to September, pink, red, white or bicolored flowers
Adult size
30 to 60 cm tall
Foliage
Deciduous, linear, grayish-green
Hardiness
Very hardy (-15 °C and below)
Origin
Mountainous regions of southern Europe and Asia Minor

Care

Sunlight

Choose a sunny location (at least 6 hours of direct sun daily) to encourage generous flowering. Bearded pink tolerates partial shade but will flower less abundantly. Protect it from strong winds that can damage the stems.

Watering

Water regularly during the growing period, keeping the soil slightly moist but never waterlogged. Reduce watering in winter. Avoid wetting the foliage to prevent fungal diseases.

Soil and drainage

Bearded pink thrives in well-drained, light and limy soil. A soil that is too compact or acidic may promote rot. Enrich the soil with compost or potting soil before planting.

Fertilizer

Apply balanced fertilizer every 4 to 6 weeks during flowering to support flower production. Excess nitrogen encourages foliage at the expense of flowers.

Pruning and maintenance

Pinch young plants to encourage branching and a compact shape. Regularly remove spent flowers to extend the flowering period. Remove dried stems at the end of the season.

Pests and diseases

Watch for powdery mildew and gray mold, especially in humid conditions. Rust can also affect the plant. Promote good air circulation and avoid overhead watering to minimize risks.

Did you know?

Bearded pink owes its name to the Latin 'barbatus' meaning 'bearded', in reference to the fringed bristles present beneath the flowers, called bracts, which resemble a beard. Traditionally used in Europe for cottage gardens and flowering walls, this carnation symbolizes kindness and gratitude in the language of flowers. Its fragrant flowers attract butterflies and bees, making it valuable for gardens that respect biodiversity.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.