Highlights

Easy to Grow – Perfect for beginners and experienced gardeners alike, Sweet William thrives with minimal fuss.
Quick to Flower – Enjoy vibrant blooms in the same season you plant for instant garden colour.
Richly Fragrant – Fills your garden with a sweet, delightful scent throughout the summer months.
Spectacular Colour – Produces a striking mix of colourful flowers to brighten borders, beds, and containers.
Hardy & Reliable – Adaptable and robust, this variety performs well across UK gardens and withstands variable weather.

We're offering you a 6, 12 or 24 Sweet William Plants for £3.99, saving you up to 73% off Thompson and Morgan's's price of £14.99 (correct as of 24.02.2026).

Add Colour and Fragrance to Your Garden Instantly

Dianthus barbatus, commonly known as Sweet William, is a classic flowering biennial cherished for its clusters of bright, fragrant blooms. The 'Sweet Mixed' variety offers an eye-catching palette of reds, pinks, whites, and purples—perfect for creating lively displays in beds, borders, or patio pots.

Botanical Name: Dianthus barbatus 'Sweet Mixed'
Type: Hardy biennial/perennial bedding plant
Flowering Period: Early summer through late summer (typically June–August)
Mature Height: Up to 45cm (18 inches)
Fragrance: Notably sweet and strong—ideal for sensory gardens

Growing Guide

Sun Requirements: Prefers full sun but tolerates partial shade
Soil: Well-drained, fertile soil; neutral to slightly alkaline pH is best
Sowing & Planting: Plant outdoors from spring onwards after the last frost. Space plants about 20cm apart for best results.
Watering: Water regularly until established; avoid waterlogged conditions
Feeding: Apply a balanced fertiliser during active growth to boost flowering.

Caring for Your Sweet William Plants

Pest & Disease Resistance: Generally trouble-free but watch for slugs and aphids.
Deadheading: Remove spent blooms to encourage further flowering.
Overwintering: Mulch in colder regions if left in the ground over winter.
Suits mixed borders, cottage gardens, and containers.

Design & Companion Planting Ideas

Borders & Edging: Use as a vibrant edging plant along paths or garden beds.
Cottage Gardens: Pair with foxgloves, delphiniums, or lavender for a classic look.
Pots & Planters: Perfect for patio displays—combine with pansies or violas for extended colour.

FAQs

When is the best time to plant Sweet William?
The ideal time is spring after the last frost. You can also plant in autumn in milder regions.
How quickly will they flower?
'Sweet Mixed' blooms in the same season as planting—usually within weeks during warm weather.
What soil do they prefer?
A well-drained, fertile soil with neutral to slightly alkaline pH is ideal. Avoid heavy clay or waterlogged spots.