We're offering you a 5 or 10 Dahlia 'Collarette Mix' Tubers for £6.99, saving you up to 46% off Thompson and Morgan's's price of £12.99 (correct as of 10.02.2026).

Dahlia 'Collarette Mix': Dazzling Blooms for Every Garden

Add a vibrant splash of colour to your garden with the Dahlia 'Collarette Mix'. This carefully curated blend features classic collarette dahlias, known for their unique two-layered petals and dramatic central collars. Expect a lively display of burgundy, cream, orange, and pink flowers that brighten up borders, patios, and containers from July through October.

Why Choose Collarette Dahlias?

• Long-Lasting Flowers: Enjoy continuous blooms from midsummer until the first autumn frosts.
• Attracts Pollinators: Open-centred flowers are irresistible to bees and butterflies, helping your garden thrive.
• Tough & Reliable: Collarette dahlias are renowned for their resilience and low-maintenance nature—perfect for both new and seasoned gardeners.

Growing Guide: How to Plant & Care for Your Dahlias

• Planting Time: Plant tubers outdoors after the last frost (typically April–May in the UK).
• Location: Choose a sunny spot with fertile, well-drained soil. Dahlias love at least six hours of sunlight daily.
• Soil Preferences: Prefers neutral to slightly acidic soil (pH 6.5–7.0). Improve drainage by adding compost or grit if needed.
• Spacing: Space tubers about 30–45cm apart to allow for healthy growth.
• Watering: Water regularly during dry spells but avoid waterlogging. Mulch to retain moisture in summer.
• Feeding: Apply a balanced fertiliser every few weeks during the growing season for prolific blooms.
• Deadheading: Remove faded flowers to encourage further blooming.
• Lifting Tubers: In colder regions, lift and store tubers after foliage dies back in autumn to protect from frost.

Design Ideas & Companion Plants

• Borders & Containers: Use as a colourful centrepiece or mix with perennials like Salvia, Rudbeckia, or ornamental grasses for extended interest.
• Cottage Gardens: Pair with cosmos or zinnias for a classic summer look.
• Biodiversity Boost: Plant near lavender or echinacea to create a pollinator haven.

Dahlia 'Collarette Mix' FAQs

• When is the best time to plant Dahlia tubers?
  The ideal time is after the risk of frost has passed, usually late April to May in most UK regions.
• How tall do Collarette dahlias grow?
  Dahlia 'Collarette Mix' typically reaches heights of 60–90cm (24–36 inches).
• Do I need to lift the tubers each year?
  If you live in an area prone to hard frosts, lift and store the tubers over winter. In milder regions with well-drained soil, you may leave them in the ground with mulch protection.