Delphinium grandiflorum - Larkspur
Delphinium grandiflorum - Larkspur
Delphinium grandiflorum
Siberian Larkspur, Chinese Delphinium
A small young plant that seems to be recovering very well. I'll put a small copper filament against slugs before it starts growing again in spring. Healthy root system, as always!! Can't wait for the flowering!!! I hope this time will be the right one! To be continued......
marianne, 12/10/2025
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Description
Less spectacular, shorter, but also easier to grow, Delphinium grandiflorum has slightly loose, light spikes adorned with small remarkable single intense azure blue flowers. Well-spaced on the spike, they tirelessly renew themselves from June to September, dominating a branching plant with finely cut foliage. Easy to grow in moist, humus-bearing soil, with its head in the sun, this perennial larkspur is also resistant to diseases and parasites.
Delphinium grandiflorum is a plant of the renunculaceae family belonging to a group of perennial varieties derived from Delphinium grandiflorum, also known as Chinese Delphinium, native to Russia, Mongolia, Japan, and China. This variety stands out for the unique blue of its flowers. The plant has a bushy and compact habit, less than 50 cm (20in) allowing it to do without staking. Floral stems emerge from a tuft of large palmate, finely divided leaves, from June to September, depending on the climate. This variety produces branching spikes, 15 cm (6in) long, adorned with 3 to 4 cm (1 to 2in) diameter, graceful and light flowers which consist of 5 petaloid sepals, the upper one extended by a delicately curled spur. They are an extraordinary blue, close to gentian blue. The plant develops from a woody rootstock that sinks vertically into the soil.
Delphiniums are very floriferous perennial herbaceous plants that always attract attention in a garden. Delphinium grandiflorum allows you to appreciate these plants for longer as they live for several years. Their characteristic silhouette always adds colour, lightness and charm to perennial plant beds. They are good companions for moss or gallica roses, with which they create charming and romantic scenes. You can also create a beautiful combination with soft orange daylilies and baby's breath Rosenschleier. This variety is well suited for creating flowering pots. Its flowers hold up well in bouquets.
Note: From March to September, the stems of our delphiniums are cut short to promote better branching of the crown and achieve optimal rooting. This also prevents the stems from breaking during transport.
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Delphinium grandiflorum - Larkspur in pictures
Flowering
Foliage
Plant habit
Safety measures
Botanical data
Delphinium
grandiflorum
Ranunculaceae
Siberian Larkspur, Chinese Delphinium
Cultivar or hybrid
ingestion
Cette plante est toxique si elle est ingérée volontairement ou involontairement.
Ne la plantez pas là où de jeunes enfants peuvent évoluer, et lavez-vous les mains après l'avoir manipulée.
Pensez à conserver l'étiquette de la plante, à la photographier ou à noter son nom, afin de faciliter le travail des professionnels de santé.
Davantage d'informations sur https://plantes-risque.info
Planting and care
Delphiniums are not difficult to grow but still require some precautions: these plants dislike heavy and wet or dry and poor soils. The soil that suits them is fertile, rich in humus, not compact, moist, even in summer, but without excess water in winter, and sheltered from strong winds. Under these conditions, they will live for many years. Also be wary of slugs and snails, which can cause damage at the beginning of growth.
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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