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Dahlia Purple Gem

Dahlia Purple Gem
Dahlia

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Cactus-like, ruffled flowers 15 cm in diameter, with pointed, chiselled petals and a purplish magenta colour. Truly flamboyant, they bloom from July to October on a bushy plant that grows to 80 cm (32 in)  to 1 m (3ft) tall. This dahlia adds a fantastic splash of colour to sunny beds and floral arrangements.
Flower size
15 cm
Height at maturity
90 cm
Spread at maturity
50 cm
Exposure
Sun
Hardiness
Hardy down to -4°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time March to May
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Flowering time July to October
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Description

The Dahlia 'Purple Gem' is a semi-cactus variety that stands out with its large, ruffled flowers in magenta violet. They are produced abundantly from summer until the first frost on a beautiful, tall, bushy clump. This variety brings colour and dynamism to sunny beds and floral compositions.

Dahlias belong to the aster family and are originally from the high plateaus of Mexico. Currently, the thousands of horticultural varieties obtained by humans have invaded gardens worldwide, much to our delight. They are perennial plants with fleshy tubers. The 'Purple Gem' variety forms a clump that reaches 80 cm (32in) to 1 m (3ft) in height and about 50 cm (20in) in width. It is classified as a cactus dahlia, or more precisely, a semi-cactus lace variety; this is a horticultural category defined by the shape of the flower. In this group, the coloured ligules of the head are incompletely rolled up, at least one-third of their length. This Dahlia has slightly curled ligules at their tips, randomly split, and more flattened at the base. The flowering of this variety begins in July and ends in October-November. The heads measure 15 cm (6in) in diameter. The habit is bushy and upright, with very branched hollow stems. Its leaves are opposite, pinnatisect, dividing into 3 or 5-toothed lobes. The leaves are bright green.

If you remove the faded flowers, you will enjoy a prolonged flowering period. Combine various varieties to create beautiful full bouquets with generous dahlias. Lighten the silhouette of dahlias by pairing them with more airy flowers such as gauras, salvias, or coneflowers. Delicate foliage plants like grasses play the same role and add beautiful golden spikes. Plant 'Purple Gem' in the middle of a bed of bushes and lower perennials, accompanied by blue or pink flowering plants or even salmon-coloured ones like some daylilies.

As a star plant for borders and cottage gardens, Dahlias confidently accompany the most beautiful flowers, but are also appreciated alongside vegetable plants. This tuberous plant was initially cultivated as a root vegetable for consumption in Mexico. However, its poor taste qualities relegated it to the rank of an ornamental plant.

Plant habit

Height at maturity 90 cm
Spread at maturity 50 cm
Growth rate fast

Flowering

Flower colour violet
Flowering time July to October
Inflorescence Flower head
Flower size 15 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Dahlia

Cultivar

Purple Gem

Family

Asteraceae

Other common names

Dahlia

Origin

Cultivar or hybrid

Product reference20934

Planting and care

The Dahlia is easy to grow in all regions. For abundant flowering, it is good to follow a few simple rules. Plant the tubers in full sun when the last frost is over. Rich, fresh, and well-drained soil is perfect. However, stagnant humidity would promote tuber rot. Feel free to amend the soil with compost and sand if needed. Work the soil deeply and enrich it, for example, with blood, fish and bone. Place your tuber and crumble the soil well to fill without air pockets. Your dahlia should be covered with about 6 cm (2in) of soil. At the end of planting, water once abundantly and then regularly water during the first six weeks to help with root development.

Dahlias are sensitive to cold, so they need to be overwintered. In November, the first frosts blacken the foliage, which is the time to dig them up. Carefully remove the tubers from the ground. Remove as much soil as possible. Let the foliage dry so that the tubers can replenish their reserves. Then cut the stems to 10 cm (4in). Spread your bulbs in a box of newspaper. Store them in a frost-free, dry, cool, dark place like a garage or attic. In mild climates close to the coast, with few days of frost per year, it is possible to leave them in place. In this case, cover the ground with a layer of leaves or straw for protection.

Tall dahlias with hollow stems are not resistant to wind or heavy rain. To overcome this disadvantage, you can stake them, but let's agree, it's not very aesthetic. On the other hand, by pinching the stems early or removing the axial flower buds, you will spread out the habit of the plant, which will offer more resistance to bad weather. At the same time, you channel the sap flow to a single flower that will become larger and stronger.

Planting period

Best planting time March to April
Recommended planting time March to May
Planting depth 12 cm

Intended location

Suitable for Meadow
Type of use Border
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Fertile, well-draining.

Care

Pruning instructions Remove faded flowers regularly.
Pruning Pruning recommended once a year
Pruning time July to September
Soil moisture Moist soil
Disease resistance Very good
Overwinter Needs to be stored

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