We're offering you a Dahlia coccinea Gardenetta Trio for £5.99, saving you up to 54% off Thompson and Morgan's's price of £12.99 (correct as of 16.04.2026).

Dahlia coccinea 'Gardenetta Trio' – Botanical Beauty for Every Garden

The Dahlia coccinea 'Gardenetta Trio' is a stunning flowering perennial known for its lush, double blooms and almost-black foliage. Belonging to the Asteraceae family, this dahlia variety brings bold colour and texture to any outdoor space. Its dramatic contrast between dark leaves and bright flowers makes it a standout choice for borders, pots, or mixed planting schemes.

Why Choose 'Gardenetta Trio'?

• Seasonal Impact: Enjoy continuous blooms from midsummer right through to the first frost.
• Visual Drama: Deep, nearly black foliage intensifies the effect of the vibrant flowerheads.
• Low Maintenance: Dahlias are easy to grow and reward you with impressive displays season after season.
• Flexible Planting: Perfect for pots, raised beds, or directly in the ground—adaptable to your garden’s needs.

Growing Guide

• Planting Time: Plant tubers outdoors after the last frost, typically from late April to May in the UK.
• Soil Requirements: Prefers fertile, well-drained soil with a neutral to slightly acidic pH (6.5–7.0).
• Sunlight: Requires full sun (at least 6 hours daily) for optimal flowering.
• Mature Size: Typically reaches around 60–90cm in height, ideal for mid-border planting or large containers.

Care & Maintenance

• Watering: Water regularly during dry spells but avoid waterlogging.
• Feeding: Apply a balanced liquid fertiliser every few weeks during the growing season.
• Deadheading: Remove spent flowers to encourage continuous blooming.
• Lifting Tubers: In colder regions (below USDA Zone 8), lift and store tubers after foliage dies back in autumn.

Design Ideas & Companions

• 'Gardenetta Trio''s bold colours pair beautifully with ornamental grasses, salvias, or cosmos for a vibrant summer display.
• Add structure with evergreen shrubs nearby to keep interest year-round.

FAQs

• When is the best time to plant Dahlia coccinea 'Gardenetta Trio'?
  Plant outdoors after the last frost—typically late April to May in the UK.
• How tall does this dahlia grow?
  Expect mature plants to reach approximately 60–90cm in height.
• Does it require lifting in winter?
  Yes, in colder areas dig up and store tubers after the first frost. In mild regions, mulch heavily if left in situ.