Dahlia Philadelphia
Dahlia Philadelphia
Dahlia Philadelphia
Dahlia Philadelphia
Dahlia Philadelphia
Dahlia Philadelphia
Dahlia
My dahlia is darker than in the picture, but I really like it.
Thérèse D., 08/12/2018
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This plant carries a 6 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
The Decorative Dahlia Philadelphia produces elegant flowers, perfectly uniform in dark red. They are architectual, fully double, medium-sized, composed of countless wide and almost flat petals. It blooms for a long time, from summer to autumn, above a strong medium green clump. A star plant in ornamental gardens, it pairs well with white, pink, and deep violet shades, planted at the back of perennial borders. Its flowers are great for making generous bouquets.
Dahlias are tuberous plants from the large Asteraceae family, originally native to the high plateaus of Mexico. Currently, the approximately 25,000 horticultural varieties obtained by humans have invaded, to our great pleasure, gardens worldwide. Dahlias are classified according to the shape of their flower. 'Philadelphia' is classified in the category of Decorative Dahlias. In this group, the coloured ligules of the head are arranged regularly in a spiral, they can be curved towards the stem or even fringed, for example. In this variety, the heads are about 8-10 cm (3-4in) in diameter and their ligules are a very rich red. The flowering period is from July to October. The plant will reach 1.20 to 1.50 m (4 to 5ft) in height, and 60 cm (24in) in width, with a bushy and erect habit. The highly branched stems are hollow and the leaves are opposite, pinnately compound, meaning they are divided into 3 or 5 leaflets, which have very denticulate lobes. The leaves and stems are medium green.
To promote repeat flowering and extend the flowering period, be sure to remove faded flowers. Even better, regularly create attractive colourful displays by combining various varieties. The tall stature of this variety makes it suitable for the back of perennial borders, of course, to structure a composition of flowering shrubs and lower perennials. The flowering of Echinaceas is a perfect accompaniment to that of Dahlias, as they occur simultaneously, as well as the flowering of perennial salvias for example. Also consider ornamental grasses (Miscanthus saccharifolius, Stipa arundinacea, Eragrostis trichodes) that take on beautiful colours in autumn.
A star plant in ornamental gardens, dahlias are undoubtedly beautiful flowers, they are perfect in flower beds but can also enhance the vegetable garden. In Mexico, this tuberous plant was first cultivated as a root vegetable for consumption. Its poor taste qualities quickly assigned it the status of an ornamental plant. Since then, the interest in their beautiful exuberance has never waned.
Dahlia Philadelphia in pictures
Plant habit
Flowering
Foliage
Botanical data
Dahlia
Philadelphia
Asteraceae
Dahlia
Cultivar or hybrid
Planting and care
The decorative Dahlia 'Philadelphia' 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 as soon as the last frost has passed. Rich, damp, and well-drained soils are perfect. However, waterlogging would promote tuber rot. Do not hesitate to amend the soil with compost and sand if necessary. Work the soil deeply and enrich it, for example, with bonemeal. Place your tuber and crumble the soil 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 renew this watering during the first 6 weeks to help with rooting.
Dahlias are sensitive to cold, so they need to be overwintered. In November, the first frosts cause the foliage to turn black, which is the time to dig them up. 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 10 cm (4in). Spread your bulbs in a box on newspaper. Store them in a frost-free, dry, cool, and dark place, such as a garage or attic. In southern regions, close to the coast, where there are few frosty days per year, it is possible to leave them in place. In this case, simply cover the ground with a layer of leaves or straw as protection.
This large-sized Dahlia, with its hollow stems, is not resistant to wind or heavy rain. To overcome this inconvenience, you can stake it, but let's admit, it is not very aesthetically pleasing. On the other hand, by pinching the stems early or removing the axillary flower buds, you will spread out the habit of the plant, which will offer more resistance to inclement weather. At the same time, you channel the flow of sap to a single flower that will become larger and stronger.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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