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Delphinium Guardian White - Larkspur

Delphinium (x) elatum Guardian White (Guardian series)
Candle Larkspur, Tall Larkspur

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A variety from the Guardian series, renowned for its uniform flowers and early flowering. This vigorous plant is not very tall, but eye-catching with its dense spikes of double, beautiful pearl white flowers, sparkling under the sun. It is perfect as a cut flower due to the size of its stems and spikes. To be grown in the sun, in rich and moist soil.
Flower size
4 cm
Height at maturity
1.20 m
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil
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Best planting time February to March, September to October
Recommended planting time February to April, September to November
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Flowering time June to July
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Description

Delphinium 'Guardian White' is a highly sought variety for cut flowers, due to the size of its stems and spikes which are ideal for bouquets. It blooms early in summer from a compact clump of foliage. The sturdy spikes are densely packed with double, pearl white and shimmering flowers. As with other cultivars in the Guardian series, the colour is very uniform. The vigorous plant is not very tall, but eye-catching.

The 'Guardian White' Delphinium belongs to the ranunculus family. It comes from Delphinium elatum, the tall larkspur, which is found in moist meadows at high altitudes in the Pyrénées-Orientales, and in all the Alps of Europe, as well as in southern Europe, central and eastern Europe, up to Siberia, Mongolia and China. This plant has given rise, among others, to the famous 'Pacific Giant' series and the 'Guardian' series. It is a large herbaceous perennial plant with a short lifespan, but rapid growth. 'Guardian White' forms a clump of deeply cut palmate, rich green foliage, from which floral spikes about 1.20 m (4ft) high and 30 cm (12in) wide emerge in summer. Flowering takes place from June to September and is loved by pollinators. The flowers are double, densely clustered on tall, upright and sturdy spikes. They have shimmering, pearl white petals, around a large collar, called a "fly" or "bee". The plant develops from a woody rhizome that penetrates vertically into the ground.

Delphiniums or Larkspurs are towering plants that provide structure to borders with their majestic presence. Their tall volume takes up minimal space on the ground and is essential amidst more rounded plants. They can be planted in groups or as solitary specimens, in front of a dark hedge of evergreen shrubs or conifers. They thrive in a sunny position sheltered from strong winds, in deep, humus-bearing soil which remains moist even in summer. Plant them alongside perennial geraniums with domes covered in flowers, baby's breath for lightness, and ornamental garlic for contrast in form. They blend equally well in a formal border or a more informal meadow. 'Guardian White' fits well in a white garden, thanks to its uniform and pure white colour, alongside roses, daylilies, or peonies, for example. It blooms for a long time as long as the flower spikes are cut off as they fade and provides excellent flowers for bouquets.

Note: From March to September, the stems of our delphiniums are pruned short to promote better branching of the rootstock and achieve optimal rooting. This also prevents the stems from breaking during transportation.

 

 

Delphinium Guardian White - Larkspur in pictures

Delphinium Guardian White - Larkspur (Flowering) Flowering

Flowering

Flower colour white
Flowering time June to July
Inflorescence Spike
Flower size 4 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 1.20 m
Spread at maturity 30 cm
Growth rate fast

Safety measures

Potential risks Plant may be toxic if swallowed

Botanical data

Genus

Delphinium

Species

(x) elatum

Cultivar

Guardian White (Guardian series)

Family

Ranunculaceae

Other common names

Candle Larkspur, Tall Larkspur

Origin

Cultivar or hybrid

Planting and care

Delphinium 'Guardian White' is not difficult to grow but still requires some precautions: delphiniums dislike heavy and damp soils, as well as dry and poor soils. The soil that suits them is deep soil, rich in humus, non-compact, moist even in summer, but not excessively wet in winter, and sheltered from strong winds. In these conditions, they will live for many years. Also, watch out for slugs that can cause damage at the beginning of the growing season. Full sun will limit the risk of mildew. Install tall stakes around the plants.

Planting period

Best planting time February to March, September to October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow
Type of use Edge of border
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 4 per m2
Exposure Sun
Soil pH Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, rich in humus, moist in summer

Care

Pruning instructions Pruning the faded flowers allows for a second flowering in early autumn. Cut back in late autumn.
Pruning Pruning recommended once a year
Pruning time November
Disease resistance Good
Overwinter Can be left in the ground

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