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Dahlia Penhill Autumn Shade

Dahlia Penhill Autumn Shade
Dahlia

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This unique semi-cactus variety bears fully double salmon-pink flowers with pointed petals and a golden yellow base. They are 20cm (8in) in diameter. The flowers bloom in abundance on a bushy plant reaching 1m (3ft) in height. The shades of this dahlia will illuminate your garden and make your floral arrangements shine from summer to frost.
Flower size
20 cm
Height at maturity
1 m
Spread at maturity
60 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 November
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Description

Dahlia 'Penhill Autumn Shade' attracts all eyes with its large, fully double flowers, reaching the size of a plate. Its pointed petals display a beautiful harmony of salmon-pink, apricot, and golden yellow tones. They are produced in abundance from summer until the first frost, on a medium-sized bushy plant. This unusual variety will bring a warm and soft touch to sunny borders and floral arrangements.

 

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.

'Penhill Autumn Shade' was registered in 2005. The plant forms a clump that is 1m (3ft) tall and about 60cm (24in) wide. It is classified as a semi-cactus dahlia, a horticultural category defined by the shape of the flower. In this group, the coloured ligules of the head only partially curl for at least one-third of their length. This dahlia has curled ligules at their tips, wide at the base. The flowering of this variety begins in July and ends in October-November. The heads measure 20cm (8in) in diameter, with yellow ligules at the base and a predominantly salmon-pink colour, with the flower's centre being pink. It has a bushy and erect habit, and the highly branched stems are hollow. Its leaves are opposite and divided into 3 or 5 toothed lobes. The leaves are a medium green colour, with the stems varying in shade from green to purple.

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

'Penhill Autumn Shade' is an exceptional cut flower that pairs particularly well with asters and heleniums. In the garden, it can be placed at the back of perennial borders, where it can lean on bushes. It will look wonderful with pink, orange, yellow, and white blooms, especially those of roses and geums. In a mixed border, it will blend perfectly with tall "thistles" (cardoon and artichoke), fennel, cosmos, and lady's mantle, for example. It will also create a lovely and unique combination with tall sedums and miscanthus.

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.

 

Dahlia Penhill Autumn Shade in pictures

Dahlia Penhill Autumn Shade (Flowering) Flowering

Plant habit

Height at maturity 1 m
Spread at maturity 60 cm
Growth rate fast

Flowering

Flower colour salmon
Flowering time July to November
Inflorescence Flower head
Flower size 20 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Dahlia

Cultivar

Penhill Autumn Shade

Family

Asteraceae

Other common names

Dahlia

Origin

Cultivar or hybrid

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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.

This tall dahlia, with its hollow stems, is not resistant to wind or heavy rain. You can stake it, but this is not particularly aesthetically pleasing. To remove the need for staking, you can pinch the stems early or remove the axial flower buds to spread out the plant's habit, which will improve its resistance to bad weather. This also channels the flow of sap to a single flower, which will become larger and sturdier.   

 

Planting period

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

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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