Dahlia ‘Desert Gem’ | Deep Purple Cactus Dahlia Tuber

Dahlia ‘Desert Gem’ is a bold cactus-type dahlia grown for its deep purple to purple-magenta blooms with narrow, spiky petals. The dramatic flower form gives it strong garden presence and makes it a standout choice for cut-flower arrangements.

This upright dahlia flowers from summer through autumn, producing repeated blooms when regularly picked or deadheaded. It is ideal for garden beds, borders, feature planting, large pots and vases.

Supplied as a dormant dahlia tuber.

Stock Note

NOTE: This is a pre-order.

Stock is expected to be ready around the end of July, however this may push into August depending on seasonal conditions and supplier availability.

Image shown is an example picture only. Flower colour, size and form may vary slightly depending on growing conditions and seasonal availability.

If there are any supply issues, we will contact you regarding substitution options.

Any items you do not wish to have substituted will be refunded.

Features

• Cactus-type dahlia
• Deep purple to purple-magenta blooms
• Spiky, narrow-petalled flower form
• Strong upright growth
• Excellent for cut flowers and vases
• Flowers from summer through autumn
• Suitable for beds, borders, feature planting and large pots
• Best in full sun with fertile, well-drained soil
• Supplied as a dormant tuber

Plant Size Note

Supplied as a dormant dahlia tuber.

Tubers may arrive with no visible shoots or leaves. This is normal while dormant.

Tuber size, shape and eye development may vary naturally. Flowering time, height and bloom size will depend on planting time, climate, soil, water, fertilising and care.

Flower Colour and Form

Dahlia ‘Desert Gem’ produces bold purple to purple-magenta cactus blooms.

The petals are narrow and pointed, giving the flowers a spiky, starburst-like appearance. Flower colour may appear deeper purple, magenta-purple or slightly burgundy-purple depending on light, temperature and flower maturity.

Growth Habit and Mature Size

‘Desert Gem’ forms an upright, bushy plant with tall flowering stems.

Mature Height: Approximately 1–1.5m
Mature Width: Approximately 60–90cm

Staking is recommended, especially in windy gardens or rich soil where plants grow taller.

Planting and Care

Plant dahlia tubers after the risk of frost has passed and the soil has started to warm.

Choose a full sun position with fertile, well-drained soil. In very hot areas, light afternoon shade can help reduce heat stress.

Plant the tuber horizontally with the eye or growing point facing upward. Cover with approximately 5–10cm of soil.

Water lightly after planting, then avoid keeping the dormant tuber too wet before active growth begins. Once shoots are growing, water more regularly.

Soil, Watering and Feeding

Dahlias prefer rich, well-drained soil improved with compost or aged organic matter.

Water regularly during active growth, especially once buds and flowers are forming. Avoid waterlogged soil, as dormant tubers may rot if kept too wet.

Feed during active growth with a balanced fertiliser or flower-focused fertiliser. Avoid excessive high-nitrogen feeding, which may encourage leafy growth over flowers.

Flowering Season

Dahlia ‘Desert Gem’ flowers from summer through autumn.

Regular picking and deadheading encourages continued flowering through the season.

Climate and Hardiness

Dahlias grow well in many Australian climates when planted after frost risk has passed.

They are frost tender. In frost-prone areas, tubers are usually lifted and stored after the foliage dies back. In mild and frost-free climates, tubers may be left in the ground if drainage is excellent.

Protect young shoots from frost, snails and slugs.

Growing in Pots

‘Desert Gem’ can be grown in a large pot.

Use a quality potting mix, choose a container with excellent drainage and stake the plant early to avoid damaging the tuber later.

Pet Safety

Dahlias are toxic to pets if eaten and may cause irritation or digestive upset.

Keep tubers, leaves, flowers and trimmed material away from dogs, cats and other pets that chew plants.

Product Details

Plant Name: Dahlia ‘Desert Gem’
Botanical Name: Dahlia hybrid ‘Desert Gem’
Common Name: Desert Gem Dahlia
Plant Type: Flowering tuber
Supplied As: Dormant dahlia tuber
Flower Colour: Deep purple to purple-magenta
Flower Form: Cactus dahlia
Mature Height: Approximately 1–1.5m
Mature Width: Approximately 60–90cm
Flowering Season: Summer to autumn
Sunlight: Full sun; light afternoon shade in very hot areas
Soil: Fertile, moist but well-drained soil
Watering: Regular moisture during active growth
Frost Tolerance: Frost tender
Uses: Garden beds, borders, feature planting, large pots and cut flowers
Pet Safety: Toxic to pets if eaten
Shipping Restrictions: State, territory and regional biosecurity restrictions may apply

Important Note

Images show mature flowering plants and are examples only.

You will receive a dormant dahlia tuber, not a plant in flower.

Flower colour, bloom form, bloom size, height and flowering performance may vary depending on climate, soil, planting time and seasonal conditions.

Biosecurity and Shipping

State, territory and regional biosecurity restrictions may apply to dahlia tubers and live plant material.

Please check whether this item can be sent to your delivery address before ordering.

Orders placed for restricted destinations may need to be cancelled and refunded.

FAQ

What will I receive?
You will receive one dormant Dahlia ‘Desert Gem’ tuber.

Will it arrive in flower?
No. It is supplied as a dormant tuber and will need to be planted and grown on.

What colour are the flowers?
The flowers are deep purple to purple-magenta.

What type of dahlia is Desert Gem?
It is a cactus-type dahlia with narrow, spiky petals.

How tall does it grow?
Approximately 1–1.5m, depending on climate and growing conditions.

When does it flower?
Dahlias usually flower from summer through autumn.

Does it need staking?
Yes, staking is recommended for taller stems and windy areas.

Can it grow in pots?
Yes, use a large pot with good drainage and stake the plant early.

Is it good as a cut flower?
Yes. ‘Desert Gem’ is excellent for bold purple cut-flower arrangements.

Is it pet-safe?
No. Dahlias are toxic to pets if eaten.