Dahlia ‘Blue Edge’ | Giant Purple Dinnerplate Dahlia Tuber

Dahlia ‘Blue Edge’ produces enormous purple blooms that develop an attractive blue sheen in sunlight. Its fully double dinnerplate flowers can reach approximately 30cm across, creating an impressive display in garden beds, large pots and cut-flower arrangements.

Key Features

• Giant dinnerplate dahlia
• Purple blooms with a distinctive blue sheen
• Flowers can reach approximately 30cm across
• Grows up to approximately 1.5m tall
• Flowers from summer into autumn
• Suitable for garden beds and large containers
• Excellent cut flower with a good vase life
• Supplied as one dormant tuber

Product Details

• Botanical name: Dahlia hybrid ‘Blue Edge’
• Family: Asteraceae
• Type: Giant dinnerplate dahlia
• Flower colour: Purple with a blue sheen in sunlight
• Flower size: Up to approximately 30cm
• Mature height: Up to approximately 1.5m
• Plant spacing: Approximately 60cm
• Planting depth: Approximately 10cm
• Planting period: Spring to early summer
• Flowering period: Summer to autumn
• Position: Full sun to light shade
• Quantity: One dormant tuber

Despite its name, ‘Blue Edge’ is not a true blue dahlia. Its flowers are purple, with lighting conditions creating the distinctive blue-toned sheen.

Tuber size, shape and the number of visible growing points will naturally vary. Images show the expected mature flowers and are provided as a guide. Colour, size and form may vary with climate and growing conditions.

Planting and Care

Choose a sunny position with fertile, well-drained soil. In warmer regions, some protection from intense afternoon sun can be beneficial.

Plant the tuber approximately 10cm deep with the growing eye facing upwards. Space plants approximately 60cm apart and install a sturdy stake at planting time to avoid disturbing the roots later.

Water sparingly until shoots emerge, as dormant tubers can rot in persistently wet soil. Once active growth begins, water regularly during dry periods without allowing the soil to become waterlogged.

Prepare the soil with well-rotted organic matter and apply a complete fertiliser during active growth. Avoid excessive nitrogen, which can produce abundant foliage at the expense of flowers.

Remove spent blooms regularly to encourage continued flowering. Protect young growth from snails and slugs.

Growing in Pots

‘Blue Edge’ can be grown in a large pot or tub filled with premium, well-draining potting mix. Use a stable container and provide strong support for the tall stems. Flowers grown in containers may be smaller than those grown in open garden beds.

Frequently Asked Questions

What colour is Dahlia ‘Blue Edge’?
It produces purple flowers that can take on a noticeable blue sheen in sunlight. It is not a genuinely blue dahlia.

How large are the flowers?
The giant dinnerplate blooms can grow up to approximately 30cm across under suitable conditions.

How tall does it grow?
Plants can reach approximately 1.5m tall.

Does it require staking?
Yes. Staking is recommended to support the tall stems and large, heavy flowers.

Can it be grown in a pot?
Yes. Use a large, stable container with excellent drainage. Container-grown flowers may be smaller.

Is it suitable for cutting?
Yes. ‘Blue Edge’ produces striking cut flowers with a good vase life.

When should the tuber be planted?
Plant during spring or early summer once the soil has warmed and the risk of frost has passed.

What is included?
This listing includes one dormant Dahlia ‘Blue Edge’ tuber.