Cirsium rivulare Trevors Blue Wonder - Thristle
Cirsium rivulare Trevors Blue Wonder - Thristle
Cirsium rivulare Trevors Blue Wonder - Thristle
Cirsium rivulare Trevors Blue Wonder
Plume Thistle 'Trevor's Felley Find'
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Description
The Cirsium rivulare 'Trevors Blue Wonder' is a river thistle with purple thistle flowers. Compared to 'Atropurupreum', which has pink-red flowers, the flower is bluish and more violet here. A superb plant for riverbanks or flowering meadows in heavy and moist to wet soil, it is also a beautiful addition to a naturalistic garden, as long as the soil is never dry. Its large pompons sway in the wind in summer and blend pleasantly with the grasses.
Cirsiums are thistles from the Asteraceae family. Cirsium rivulare is native to Switzerland and central Europe, where it grows in wet places such as meadows and mountain marshes. It is a very cold-resistant plant, adapted to damp to fresh, clayey, and fertile soils.
The cultivar 'Trevors Blue Wonder' distinguishes itself from the species by its purple colour. It is a herbaceous perennial plant with a root system whose above-ground part disappears in winter and reappears in spring. At maturity, this river thistle will form a flowering clump about 1 to 1.20 m (3 to 4ft) tall, spreading through underground stems over 50 to 60 cm (20 to 24in) wide. It develops basal leaves and fleshy, sparsely leafy stems, with long leaves sheathing the base of the stem. The foliage is dark green; the laminae are widely dissected, slightly pubescent, and edged with thorns. Flowering occurs from June to August at the ends of the stems. It takes the form of inflorescences in heads, grouped in 2 to 8 units. Each head, which can reach 3 cm (1in) in diameter, is composed of many tiny flowers, highly visited by pollinating insects. The flowering gives way to small silky fruits called achenes, which can self-sow.
The 'Trevors Blue Wonder' river thistle thrives in full sun. It prefers heavy clayey soils that are constantly moist and waterlogged even in winter. It requires at least moist soil, never dry. This tall and wild thistle adds elegance to a meadow or the edge of a pond without requiring much care. Choose typical plants for these soils to accompany it, such as waterwort, the beautiful marsh sage, and meadow rues, to name a few. Also, consider asters and poppies in moist soil. Pennisetum and the white woodrush are beautiful companion grasses. Don't hesitate to create bouquets of dried or fresh flowers; this will prevent spontaneous sowing and promote late-season flower reblooming. This variety is not invasive.
Cirsium rivulare Trevors Blue Wonder - Thristle in pictures
Flowering
Foliage
Plant habit
Botanical data
Cirsium
rivulare
Trevors Blue Wonder
Asteraceae
Plume Thistle 'Trevor's Felley Find'
Cultivar or hybrid
Planting and care
Plant the Cirsium rivulare in a sunny location, in moist to wet soil. It prefers heavy, clayey, and fertile soils that are never dry. It will thrive along a water source or in a good wheat or beet soil, which is very dense. Add organic amendment at the time of planting as it prefers nutrient-rich soils. Well-decomposed leaf compost will do the trick. Thistles tend to self-seed in the surrounding area, so cut the flowers before they set seed if you want to limit its spread.
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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