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Delphinium Blue Diamonds - Blue Chinese Larkspur seeds

Delphinium grandiflorum Blue Diamonds
Siberian Larkspur, Chinese Delphinium

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Message received. I will sow them at the appropriate time and will provide you with my feedback if flowering occurs.

Maryse S., 24/12/2018

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This plant carries a 6 months recovery warranty

More information

This delphinium is a variety that has managed to preserve the charm of wild plants. It offers light blue flowers throughout the summer, on a bushy plant that does not exceed 50 cm (19.7 in), with very finely cut foliage, perfect for rocky gardens. This resilient flower does not require staking. It thrives in a sunny exposure and prefers moist soil.
Flower size
30 cm
Height at maturity
50 cm
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
25 days
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Sowing period March to April
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Flowering time June to September
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Description

The Delphinium grandiflorum Blue Diamonds, also known as Chinese Larkspur, is a variety that has preserved the charm of wild plants. It produces light blue flowers throughout the summer on a dense plant that is resistant to bad weather, with highly dissected foliage, perfect for rocky gardens. This weather-resistant plant does not require staking. It thrives in sunny locations with moist soil. Indispensable at the front of perennial borders, in containers, in flower pots near the house, or in bouquets, these plants flourish in the sun in humus-bearing and permeable soils.

The Delphinium Blue Diamonds, or Chinese Delphinium, is one of the many hybrids obtained by cross-breeding D. grandiflorum, which is native to mountainous regions of China, Siberia, Mongolia, and Japan. It is theoretically a perennial plant, but is most often cultivated as an annual. It is hardy and shows rapid growth, forming a dense clump, 34 to 40 cm (13.4 - 15.7 in) wide, with highly dissected palmate foliage in tender green, from which numerous floral spikes, 50 cm (19.7 in) in height, emerge in the summer. Flowering occurs from June to September and is highly visited by pollinating insects. The flowers are single, cup-shaped, arranged on large, erect, well-ventilated spikes, and display five petals of a blue color that can be seen from afar, with the upper petal having a spur. The plant develops from a woody rootstock that extends vertically into the soil.

The characteristic silhouette of Delphiniums always adds volume, verticality, and a lot of charm to perennial borders. The 'Blue Diamonds' selection allows for the quick creation of an elegant and rustic setting by sowing directly in the ground. Its intense blue color is precious, enlarging the space and highlighting small areas. When combined with white, its shade is gentle; a marriage with yellow or orange is more dynamic. Delphiniums are also great companions for moss or gallica roses, with which they create charming and romantic scenes.

Flowering

Flower colour blue
Flowering time June to September
Inflorescence Spike
Flower size 30 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased

Plant habit

Height at maturity 50 cm
Spread at maturity 40 cm
Growth rate normal

Safety measures

Potential risks Plant may be toxic if swallowed

Botanical data

Genus

Delphinium

Species

grandiflorum

Cultivar

Blue Diamonds

Family

Ranunculaceae

Other common names

Siberian Larkspur, Chinese Delphinium

Origin

Cultivar or hybrid

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Planting and care

Sow the seeds of Delphinium Blue Diamonds directly outdoors, from April to May, in full sun, in a fertile, light, well-drained soil that has been previously loosened. Bury the fine seeds to a depth of 6mm (0.2 in) in small holes spaced 30cm (11.8 in) apart. Keep the soil moist by watering regularly, especially during dry periods. Germination usually takes 14 to 21 days. When the seedlings are large enough to handle, thin them out by planting only one seedling every 15 cm (5.9 in). For earlier flowering, sow Delphinium seeds from August to October in 7.5 cm (2.8 in) pots filled with good quality compost kept moist. Place the pots in a mini-greenhouse or inside a plastic bag at a temperature of 15-20 °C (59-68 °F) until germination. Once the seedlings have developed, place them in a bright but cooler location. Overwinter the plants in a cool, bright place, protected from frost, by watering them sparingly. Transplant them to their final location in the following spring. Water regularly until the plants are fully established. Insert sturdy stakes among the tall plants, about 10 cm (3.9 in) deep, to help them stand upright. You can also support the plants with bamboo canes. Regularly remove faded flowers to encourage renewed flowering. Delphiniums thrive in sunny locations, sheltered from the wind, as well as in fertile soil, rich in organic matter and well-drained. Soil that is too wet or too dry is detrimental to the growth and flowering duration of the larkspur. Varieties derived from Delphinium grandiflorum are more resistant to diseases and pests than the larger hybrids.

Sowing period

Sowing period March to April
Germination time (days) 25 days

Intended location

Suitable for Meadow
Type of use Edge of border, Container, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Acidic, Neutral
Soil moisture Moist soil, humus-bearing, well-draining
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