Dahlia ‘Hedgehog’ Tuber | Mauve-Purple Cactus Dahlia

Add unusual flower form and rich, cool-toned colour to the garden with Dahlia ‘Hedgehog’, a distinctive cactus Dahlia producing spiky flowers in dark pink, mauve and purple tones.

Its long, narrow petals curl and quill towards pointed tips, creating a shaggy, almost animated appearance reminiscent of a hedgehog’s spines. Under lower light, the flowers may develop a subtle blue-violet cast that enhances their cool colouring.

The unusual flowers are carried on tall stems and make an impressive addition to garden displays, bouquets and cut-flower arrangements.

EXAMPLE IMAGE ONLY: The flower image shows an example of the expected mature bloom. The intensity and balance of the pink, mauve, purple and blue-violet colouring may vary naturally according to climate, growing conditions, lighting and bloom maturity. The supplied product is a dormant tuber—not a flowering plant.

Flower Characteristics

• Dark pink to mauve-purple colouring
• May display a subtle blue-violet cast in lower light
• Cactus Dahlia flower form
• Long, narrow and pointed petals
• Quilled or rolled petal structure
• Spiky, shaggy-looking blooms
• Medium-sized flowers
• Distinctive texture and movement
• Excellent for garden display and cutting

Supplied as Dormant Tubers

Supplied as the selected quantity of dormant Dahlia ‘Hedgehog’ tubers.

Dahlia tubers naturally vary in size, shape and appearance. A smaller tuber can grow just as successfully as a larger tuber when it is healthy and has a viable eye or growing point.

Tubers may arrive without visible shoots or roots. This is normal while they are dormant.

Key Features

• Named Dahlia ‘Hedgehog’
• Cactus Dahlia classification
• Dark pink, mauve and purple flowers
• Possible blue-violet undertones
• Long, quilled and pointed petals
• Distinctive spiky flower form
• Medium-sized blooms
• Grows approximately 1.2–1.5m tall
• Flowers throughout summer and autumn
• Suitable for cutting and floral arrangements
• Suitable for garden beds and large containers
• Frost-tender tuberous perennial
• Supplied as dormant tubers

Suitable Uses

• Cottage gardens
• Purple and mauve colour schemes
• Cool-toned garden displays
• Mixed flower borders
• Feature planting
• Cactus Dahlia collections
• Cut-flower gardens
• Bouquets and floral arrangements
• Large pots and containers
• Seasonal summer displays
• Pollinator-friendly garden plantings
• Dahlia collections

Planting Instructions

Plant Dahlia ‘Hedgehog’ during spring once the danger of frost has passed and the soil has begun to warm.

In many Australian climates, suitable planting time falls between September and December. Always adjust planting time according to local temperatures and frost conditions.

Choose a sunny position with fertile, free-draining soil. Avoid low-lying areas where water collects, as dormant tubers can rot in continually wet conditions.

Lay each tuber horizontally approximately 5–10cm below the soil surface, with the crown or growing point facing upwards. Cover gently with soil.

Space plants approximately 60cm apart to provide adequate room for growth and good airflow.

Install a sturdy stake at planting time. Adding support before growth begins reduces the risk of accidentally damaging the tuber later.

Avoid heavy watering immediately after planting. If the soil is already moist, wait until shoots begin emerging before commencing regular watering.

Care Instructions

Position

Grow Dahlia ‘Hedgehog’ in full sun, ideally with at least six hours of direct sunlight each day.

Light afternoon shade may be beneficial in particularly hot Australian climates. Excessive shade can result in softer stems, weaker growth and fewer flowers.

The flowers may display cooler mauve, purple or blue-violet tones under lower light, although the variety does not produce genuinely blue flowers.

Soil

Plant in fertile, humus-rich and free-draining soil.

Improve the planting area with compost or well-aged organic matter before planting. Heavy clay soil should be amended to improve drainage, or the tuber can be grown in a raised garden bed or large container.

Excellent drainage is particularly important in subtropical climates and areas experiencing heavy summer rainfall.

Watering

Once shoots emerge, water deeply and regularly while allowing the upper surface of the soil to begin drying between applications.

Increase watering during hot, dry or windy weather. Avoid keeping the soil continually saturated, particularly around the crown and tubers.

Water near the base of the plant where possible to reduce prolonged moisture on the foliage and flowers.

Feeding

Apply a balanced or flowering-plant fertiliser once active growth is established.

Avoid excessive nitrogen, which can encourage abundant foliage at the expense of flower production. Additional flowering fertiliser may be applied when buds begin developing, following the product label directions.

Staking

Dahlia ‘Hedgehog’ can grow approximately 1.2–1.5m tall, so support is recommended—particularly in windy or exposed positions.

The narrow cactus-style petals tend to hold less rainwater than broad-petalled varieties, but the tall stems can still be damaged by strong wind or heavy weather.

Install a sturdy stake at planting time and secure the stems loosely as the plant grows. Allow enough room for natural movement and stem expansion.

Pinching

For bushier growth and additional flowering stems, pinch out the central growing tip once the young plant has developed approximately four or five sets of leaves.

Pinching may delay the first flowers slightly but can encourage a fuller plant with more flowering branches.

Deadheading and Cutting

Remove faded flowers regularly to encourage continued blooming and prevent the plant from directing energy into seed production.

Flowers intended for arrangements are best cut during the cooler part of the morning. Choose well-developed flowers and place the stems into clean water promptly after cutting.

Regular cutting and deadheading can help extend the flowering period.

Hot and Humid Climates

In subtropical and humid regions, provide excellent drainage and generous spacing between plants.

Good airflow helps reduce the risk of fungal problems. Avoid continually wet foliage and water early enough for the leaves to dry before evening.

Protection from intense late-afternoon sun may help preserve flower quality during periods of extreme heat.

End-of-Season Care

After flowering, allow the foliage to remain until it begins yellowing and dying back naturally. This enables the plant to return energy to its tubers.

In mild climates with free-draining soil, the tubers may be left in the ground during dormancy. Mark the planting position and keep the area relatively dry.

Established clumps can be lifted and divided periodically to prevent overcrowding and maintain vigorous growth.

In cold, frost-prone or persistently wet climates, lift the tubers after the foliage has died back. Allow them to dry before storing them in a cool, dark, frost-free and well-ventilated location.

Product Details

Botanical Name: Dahlia hybrid ‘Hedgehog’
Cultivar: ‘Hedgehog’
Common Name: Dahlia
Family: Asteraceae
Flower Classification: Cactus Dahlia
Flower Colour: Dark pink, mauve and purple with possible blue-violet undertones
Flower Size: Medium; final size varies with growing conditions
Plant Height: Approximately 1.2–1.5m
Flowering Period: Summer to autumn
Plant Type: Frost-tender tuberous perennial
Supply Format: Dormant tuber
Position: Full sun to light afternoon shade
Soil: Fertile, humus-rich and free-draining
Planting Depth: Approximately 5–10cm
Plant Spacing: Approximately 60cm
Water Needs: Moderate during active growth
Frost Tolerance: Frost sensitive
End Use: Garden displays, large containers and cut flowers

Important Information

• The supplied product is a dormant tuber, not a flowering plant
• Tuber size, shape and appearance will vary naturally
• Tubers may arrive without visible shoots or roots
• Plant only when local growing conditions are suitable
• Avoid overwatering before shoots emerge
• Mature height and flowering time will vary with climate and care
• Flowers may appear dark pink, mauve, purple or blue-violet under different conditions
• The blue-toned appearance is an undertone rather than a true blue flower colour
• Individual flower size and colour intensity will vary naturally
• Example images show the expected mature flowers only

FAQ

What colour are Dahlia ‘Hedgehog’ flowers?

The flowers range from dark pink and mauve to rich purple. Under lower light, some flowers may display a subtle blue-violet cast.

Does Dahlia ‘Hedgehog’ produce blue flowers?

No Dahlia produces genuinely blue flowers. ‘Hedgehog’ may develop cool blue-violet undertones under certain lighting, but the primary colouring remains mauve-pink to purple.

What flower form does ‘Hedgehog’ produce?

‘Hedgehog’ is a cactus Dahlia with long, narrow petals that roll or quill towards pointed tips. This creates its distinctive spiky, shaggy-looking flower form.

How large are Dahlia ‘Hedgehog’ flowers?

‘Hedgehog’ produces medium-sized cactus-style flowers. Final flower size will vary according to climate, soil, feeding, watering and overall plant care.

How tall does Dahlia ‘Hedgehog’ grow?

Plants generally reach approximately 1.2–1.5m tall under suitable conditions. Final height will depend on climate, position, soil and care.

Will the tuber arrive flowering?

No. This product is supplied as a dormant tuber. The flower photograph shows an example of the expected mature bloom only.

Does Dahlia ‘Hedgehog’ require staking?

Staking is recommended because the plant can grow up to approximately 1.5m tall. Install a stake when planting to avoid damaging the tuber later.

Can Dahlia ‘Hedgehog’ be grown in a container?

Yes. Use a large, stable container with generous drainage holes and a fertile, free-draining potting mix. Container-grown plants require regular watering, feeding and support.