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Dahlia Windmill

Dahlia Windmill
Dahlia

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A variety of Honka dahlia with unusual bicoloured white flowers with red borders and streaks. Their petals are curled at the edges, radiating from a large golden yellow centre. This dahlia produces an abundance of stems measuring 70 to 80cm (28 to 32in), each carrying beautiful flowers. It blooms from July to October. A unique and vibrant variety that deserves a prominent spot in the garden. Its flowers are also wonderful in bouquets.
Flower size
7 cm
Height at maturity
75 cm
Spread at maturity
30 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

Dahlia 'Windmill' is a star-shaped variety that stands out with its rare red and white bicolour flowers. Its slender white petals boast curled edges, bordered or streaked with red at the centre, depending on the flowers. They radiate from the centre of the flower, occupied by a large golden yellow heart. It is a unique and vibrant variety that deserves a prominent spot in the garden, contrasting beautifully with dark foliage. Its flowers are also wonderful in bouquets.

 

Dahlias belong to the Asteraceae family and are originally from the high plateaus of Mexico. There are currently thousands of horticultural varieties that have conquered gardens worldwide. They are tender perennials with fleshy tubers.

Dahlia 'Windmill', introduced in 2019, is a perennial plant with swollen tuberous roots. These tubers, gathered in bundles, produce upright, hollow and branched stems as soon as the temperature rises in spring, bearing compound, odd-pinnate leaves with rounded leaflets. The sturdy, fleshy stems are approximately 70 to 80cm (28 to 32in) tall, and are topped with inflorescences called heads, which are 7 to 8cm (3in) wide. The Honka series is part of the horticultural family of star-shaped dahlias, defined by the shape of the flower. The foliage of this variety is a vibrant green colour.

Remove faded flowers to encourage new blooms. You can use cut flowers to make colourful bouquets, combining them with other varieties.

'Windmill' pairs particularly well with delicate flowers and purple foliage (silver candles, heuchera) that won't overshadow the delicacy of its flowering. Consider planting it with nigella, cosmos, centaurea, and scabiosa, which bloom at the same time. It also works well with asters and Verbena bonariensis.

Dahlias are stars of borders and ornamental gardens, confidently accompanying the most beautiful flowers. However, they are also appreciated alongside vegetable plants. In Mexico, this tuberous plant was first cultivated as a root vegetable for consumption. Its poor taste qualities quickly saw it categorised as an ornamental plant. Since then, the interest in their beautiful exuberance has never waned.

Tips: when planting, consider the dimensions of the dahlia in terms of your flower beds.

Dahlia Windmill in pictures

Dahlia Windmill (Flowering) Flowering

Plant habit

Height at maturity 75 cm
Spread at maturity 30 cm
Growth rate fast

Flowering

Flower colour two-tone
Flowering time July to October
Inflorescence Flower head
Flower size 7 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Dahlia

Cultivar

Windmill

Family

Asteraceae

Other common names

Dahlia

Origin

Cultivar or hybrid

Planting and care

Plant in spring as soon as the last frost has passed. For abundant flowering, plant the tubers in full sun in rich, moist but well-drained soil. Stagnant moisture causes tuber rot. Amend the soil with compost and sand, if necessary. Work the soil deeply and enrich it, for example, with crushed horn or dehydrated blood. Place your tuber and crumble the soil well to fill without air pockets. Cover with about 6cm (2in) of soil. At the end of planting, water once abundantly and then repeat this watering regularly during the first 6 weeks to help with rooting. 

Dahlias are sensitive to cold, so they need to be overwintered. Dig the tubers up when the first frost has blackened the foliage. Carefully remove the tubers. Remove as much soil as possible. Let the foliage dry so that the tubers can replenish their reserves. Then cut the stems to 10cm (4in). Spread your bulbs in a box lined with newspaper. Store them in a frost-free, dry, cool, and dark place, such as a garage or attic. In mild regions without frost, or those close to the coast, it is possible to leave them in place. In this case, simply cover the ground with a carpet of leaves or straw for protection.

Staking may be necessary, as the stems reach at least 90cm (35in) in height.

Planting period

Best planting time March to April
Recommended planting time March to May

Intended location

Suitable for Meadow
Type of use Border, Vegetable garden
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Amateur
Planting density 3 per m2
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Fertile, well-draining.

Care

Pruning instructions Remove faded flowers to extend the blooming period.
Pruning Pruning recommended once a year
Pruning time July to September
Soil moisture Moist soil
Disease resistance Good
Overwinter Needs to be stored

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