Clematis patens Royal Crown
Clematis patens Royal Crown
Clematis patens Royal Crown
Clematis patens Royal Crown
Clematis patens Couronne Royale
Delivery was very well done, the plants arrived well protected and vigorous. We planted them properly with a well-drained soil enriched with silver pellets, a 50/50 mix of compost and soil, placed a tile to protect the root part from excess moisture, a trellis for growth, then bark for mulching. We will see next year, I am optimistic with the 5-star rating, just waiting for them to thrive in a beautiful setting.
Eddy, 12/11/2024
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Description
Clematis 'Royal Crown', also known as 'Haku Ookan' or 'Hakuokan', is a lovely Japanese variety that produces large and beautiful star-shaped flowers in shades of purple to dark blue-violet, adorned with a magnificent bouquet of white stamens with pale-yellow anthers. These flowers are often semi-double at the beginning of flowering, then single. It is a medium-sized variety, but vigorous. It blooms from late spring to late summer. It will find its place in gardens of all sizes, as well as on patios and balconies, planted in a large pot.
Clematis belong to the Ranunculaceae family. They can be found in Europe, the Himalayas, China, Australia, and North and Central America. The 'Royal Crown' variety, with unknown parentage, was obtained in 1957 by Yashio Kuboto. It is a perfectly perennial, semi-woody, climbing plant that will reach a height of approximately 3.50m (11ft), with a minimum spread of 1.5m (5ft). This clematis bears large, fully open flowers that can reach 15 to 18cm (6 to 7in) in diameter. They appear in successive waves on the new shoots from May-June until the end of summer. The flowers are solitary and have pointed, inwardly curved tepals in intense violet with bluish reflections. The centre of the flower is adorned with a beautiful crown of stamens with a white base and pale-yellow anthers. The flowering is followed by decorative silver-grey feathery fruits that persist until winter. The glabrous leaves are divided into 3 elliptical to lanceolate leaflets that are dark green in colour. This clematis firmly attaches itself to the support or host plant through petioles that are transformed into tendrils.
Plant your clematis alongside climbing or rambling roses ('New Dawn', 'Mme Caroline Testout', 'Zephirine Drouhin') to extend the flowering season of walls and pergolas until the end of summer. It is a diverse genus, with flowers of all colours, shapes, and sizes. Take advantage of their easy cultivation to give your garden a romantic and bohemian touch. It will pair well with the blue flowers of C. Hudson River, the violet flowers of C. 'Romantika', or the red flowers of C. 'Rebecca' or C. 'Rouge Cardinal', for example, climbing a fence or covering a wall exposed to the morning sun.
Avoid excessive use of fertilisation, as it stimulates foliage growth at the expense of flowers. Do not mulch in order to prevent excessive moisture.
Clematis patens Royal Crown in pictures
Plant habit
Flowering
Foliage
Botanical data
Clematis
patens
Couronne Royale
Ranunculaceae
Cultivar or hybrid
Planting and care
Clematis 'Royal Crown' will appreciate a sunny or lightly shaded position. Plant it in fertile, humus-rich, well-drained soil, shading the roots and the base of the stem (with a flat tile, for example). Clematis wilts in overly wet soil. Plant it in well-prepared soil, lightened with good compost and coarse sand. Position the plant with the root ball at an angle and cover it with 3cm (1in) of soil. After planting, cut back the stems to about 30cm (12in) from the base above a pair of buds. Water generously and regularly during the first few weeks. However, do not let water stagnate as this can cause fungus to develop at the collar.
Mulch all clematis in February with garden compost or well-rotted manure, avoiding direct contact with the stems.
Train the stems, without squeezing them, until the plant can cling on its own. Clematis also like to grow freely on neighbouring plants.
After a few years, cover the base of your climbing clematis with a small mound of soil, to reduce the risk of wilting, while promoting the emergence of vigorous shoots from the stump.
Voles and grey worms can attack clematis and devour the stems. Aphids and greenhouse whiteflies are also potential pests.
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).
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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.