Dahlia Dr Ph. Riedell
Dahlia Dr Ph. Riedell
Dahlia Dr Ph. Riedell
Dahlia
Great similarity to the less vigorous Nicholas dahlia.
Gustave R., 15/08/2018
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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 Dahlia 'Dr Ph. Riedel', sometimes spelled 'Dr. P.H Riedell', is an old variety of decorative dahlia that has never disappeared from catalogues since 1966, when it won a Silver Cup in Stuttgart. Its medium-sized flowers display beautiful shades of orange and are carried by perfectly matched brown stems and are produced abundantly between summer and early autumn. A reliable choice, to be paired with red flowers or the blond spikes of grasses.
The Dahlias are part of the large family of asteraceae. Dahlia varieties are classified according to the shape of their heads. 'Dr P.H Riedel' is a Dahlia from the decorative group with camellia-like flowers. The terminal inflorescences, called heads, are 12 cm (5in) wide and carried by dark stems. They are flattened, composed of several rows of almost flat outer ligules. The colour of the flowers changes throughout the day, combining different shades of orange, ranging from bright to soft, with a golden or salmon pink hue in the centre and along the edges. The small yellow centre only appears late, just before wilting. The plant will reach approximately 1.10 m (4ft) in height and 60 cm (24in) in width. It has an upright habit and its tall stems may require staking. Its beautiful dark green leaves are divided into highly denticulate lobes. The particularly long flowering period of this variety begins in July and ends in October-November, if faded flowers are removed or frequently used in bouquets.
Today, Dahlias are essential in gardens, whether it be ornamental gardens or even vegetable gardens. They were initially cultivated in Mexico as a root vegetable. Their poor taste quickly relegated them to the status of ornamental plants, but they are still welcome in vegetable gardens to add a splash of colour among the vegetables. 'Dr P.H Riedel' is a superb plant that can be used to structure elevated beds, and can be paired with purple foliage, for example (Cotinus 'Royal Purple', Physocarpus 'Red Baron', Sambucus nigra 'Black Lace'). It pairs particularly well with red, blue, plum, and even chocolate-coloured flowers.
At the first frost, dahlia bulbs should be stored in a dry place, protected from light and frost.
Plant habit
Flowering
Foliage
Botanical data
Dahlia
Dr Ph. Riedell
Asteraceae
Dahlia
Cultivar or hybrid
Planting and care
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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