Sanguisorba officinalis Red Thunder
Sanguisorba officinalis Red Thunder
Sanguisorba x officinalis Red Thunder
Great Burnet
Planted in spring, it produced very lovely leaves. But not a single flower, it probably suffered from the intense heat this summer?
Sabine, 21/10/2025
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Description
The Sanguisorba officinalis 'Red Thunder' is a variety of Great Burnet that works wonders in flower meadows or naturalistic-inspired beds. Above a tuft of beautifully cut grey-blue foliage stands a multitude of flowers in dark purple-red spikes, which are given an elusive beauty by the slightest breeze. The flowering lasts throughout the summer, fading to a brown colour that blends beautifully with wildflowers and grass root hairs. The stump, very vigorous, also proves perfectly hardy, even in heavy, waterlogged soils in winter. It will give sunny beds a natural and colourful touch. The Common Burnet is originally a plant that thrives in fresh to moist soil, making it a sensation near water sources.
The Sanguisorba officinalis is a medicinal botanical species widespread throughout the entire temperate Northern Hemisphere. It belongs to the large family of Rosaceae. It is a non-invasive, herbaceous rhizomatous perennial plant that develops from a vigorous stump. The foliage emerges in spring and disappears in winter.
The 'Red Thunder' cultivar was selected for its increased floribundity, the beauty of its flowers, and its excellent resistance to wind and bad weather. Under good conditions (in fresh and fertile soil), it forms a tuft of approximately 1.10 m (4ft) in height, 60 cm (24in) in width, with a rapid growth rate. It spreads slowly to form beautiful leafy masses with a very fresh grey-blue colour. From June to August, tall flower spikes emerge from the foliage, bearing erect, cylindrical, 4 cm (2in) long spikes. They are adorned with tiny purple-red flowers. The faded and browned inflorescences remain decorative for a long time. This flowering stands out prominently against the beautifully cut foliage. The basal leaves, 20 to 30 cm (8 to 12in) long, are divided into 7 to 25 leaflets, oblong, elliptical, and regularly toothed. The leaves of the stems, smaller and upright, are often tinged with red.
The compact 'Red Thunder' Sanguisorba officinalis can be placed in the heart of flower beds, in a flower meadow or at the edge of a pond, in soil that will not dry out even in summer, even if it tends to be calcareous and clayey. It has the advantage of being highly resistant to cold. For a wild and refined effect, it can be planted en masse, combined with Lychnis Jenny, Cirsium Atropurpureum, Miscanthus sinensis var. condensatus 'Cosmopolitan', or Pennisetum orientale 'Karley Rose'. It will accompany with lightness other beautiful foliage plants, such as Anaphalis triplinervis, Alchemilla mollis, or the tall Angelica gigas. Its foliage with a delightful cucumber aroma can also be added to mixed salads.
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Sanguisorba officinalis Red Thunder in pictures
Flowering
Foliage
Plant habit
Botanical data
Sanguisorba
x officinalis
Red Thunder
Rosaceae
Great Burnet
Cultivar or hybrid
Planting and care
The Sanguisorba officinalis 'Red Thunder' prefers always moist, even waterlogged, humus-rich, clayey, loamy, rather chalky soils, and a sunny exposure. This lovely perennial plant native to cold regions, likes a cool and rich soil. Easy to grow under such conditions, it easily naturalizes in the garden through its rootstock and spontaneous sowings (not always faithful to the mother plant). Its faded flowers remain decorative for a long time in winter: prune the clump before the start of vegetation, in spring.
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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