We're offering you a 30 or 60 Mixed Sweet William Plants for £7.99, saving you up to 64% off Thompson and Morgan's's price of £21.99 (correct as of 24.02.2026).

Add Instant Colour and Fragrance with Sweet William (Dianthus barbatus)

Bursting with charm and colour, Sweet William (Dianthus barbatus 'Sweet Mixed') is a classic cottage garden favourite. This biennial is renowned for its clusters of vibrant blooms, rich fragrance, and ability to flower in the same season when planted as plug plants. With this special offer, receive either 30 or 60 healthy plug plants ready to transform your garden beds, borders, or patio containers.

Why Choose Sweet William?

• Quick Results: These plug plants are quick to establish and flower, offering colourful displays from late spring through summer.
• Scented Blooms: Enjoy the sweet, spicy fragrance that attracts pollinators such as bees and butterflies.
• Diverse Uses: Perfect for mixed borders, cottage gardens, or as cut flowers for indoor arrangements.
• Tough & Reliable: Hardy in UK conditions (RHS H4), tolerates light frosts, and thrives in a range of soil types.

Growing Guide

• Planting Time: Pot on immediately upon arrival. Plant outdoors after the last frost (typically April–May).
• Location: Prefers full sun but tolerates partial shade. Ideal for well-drained soil with moderate fertility (neutral to slightly alkaline pH).
• Caring For Your Plants: Water regularly until established. Deadhead faded flowers to encourage more blooms. Fertilise lightly with a balanced feed during active growth.
• Mature Size: Grows up to 45cm tall and spreads to around 30cm wide.
• Pruning: Cut back after flowering to tidy plants and encourage bushier growth next year.

Design Tips & Companion Planting

• Create vibrant borders by pairing Sweet William with foxgloves, delphiniums, or hardy geraniums.
• Add to containers alongside violas or pansies for continuous colour.
• Their upright habit makes them ideal for cutting gardens—enjoy fresh bouquets indoors!

FAQs

• When should I plant Sweet William plug plants?
  Pot on immediately on arrival; plant outdoors after the last frost in spring (April–May).
• How long until they flower?
  You’ll see blooms within the same season—typically late spring through summer.
• What care do they need?
  Sit in full sun or part shade, water regularly until established, deadhead spent blooms, and feed with balanced fertiliser during growth.