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Hardy perennial
Ranunculaceae
Perennials
Larkspur 'Summer Night'
Large-flowered larkspur
Larkspur 'Summer Night': 30 cm high and 30 cm spread, sun to partial shade. Blue flowers in June-August. Zone 3; choose a soil compatible with its moisture needs.
- Exposure
- Sun/partial shade
- Life cycle
- Hardy perennial
- Hardiness
- Zone 3
Discover the plant
Common nameLarkspur 'Summer Night'
FamilyRanunculaceae
GenusDelphinium
SpeciesLarge-flowered
CultivarNuit d'été
TypeHardy perennial
Botanical nameLarge-flowered larkspur
Larkspur 'Summer Night' (Delphinium grandiflorum 'Summer Night') adds a palette of blue to the garden. The foliage has shades of green, to be highlighted among different textures. The usual flowering period is June-August. The clump reaches approximately 30 cm in height with a spread of 30 cm; use these dimensions to position the plant at the front and lower edge of a bed.
In terms of cultivation, Larkspur 'Summer Night' prefers sun to partial shade; the recommended soil is humiferous, retaining its freshness during growth, without standing water around the crown. For Larkspur 'Summer Night', regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate water requirements. Maintain a distance of 30 cm between plants; this helps preserve their shape and allows access for care. The indicated hardiness zone is zone 3, to be assessed according to your garden's conditions.
Throughout the seasons, Larkspur 'Summer Night' benefits from timely care: after flowering, remove spent flower stalks above healthy foliage and continue appropriate watering. Tall delphinium spikes may require support in windy areas; plan for this before they are fully developed. For companion planting, consider coneflowers, campanulas, and perennial geraniums in varieties with similar needs. The flowering period (June-August) and the 30 cm spread will serve as guides for arranging other plants around this one.
Planting guide
From planting to establishment.
Spacing / density
30 cm
Best planting time
Spring after the thaw, or early autumn, allowing the roots time to establish themselves before the severe cold.
Growing method
Larkspur 'Summer Night': In spring after the thaw or in early autumn, allowing the roots time to establish before the cold weather sets in. For Larkspur 'Summer Night', regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water. The tall delphinium spikes may require support in windy areas; plan for this before they are fully grown.
Soil and care
The right care,at the right time.
Soil pH
alkaline; general indication of botanical group
Care level
Regular maintenance
Watering
For 'Summer Night' larkspur, regularly check the soil around the root ball: it must remain moist. Water at the base when the surface starts to dry and adjust the water supply according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water.
Soil type
Humus-rich, keeping its freshness during growth, without stagnant water around the collar
Fertilization
Fertilizer for flowering
Moisture
Regular cooling during growth
Seasonal care
Larkspur 'Summer Night': after flowering, remove spent flower stalks above healthy foliage and continue to water as appropriate for the soil. During its flowering period (June-August), also monitor damaged stems and neighboring plants that might obscure the clump.
Container growing
A garden,within reach.
Recommended pot size
Stable container with drainage, significantly wider than the root ball; dimensions to be adapted to the sold format and to the adult development.
To try out Delphinium 'Summer Night' in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (30 cm). The substrate must remain moist; it will dry out faster than in open ground. Plan to protect the container in winter depending on your climate.
Bloom and dimensions
Its place,in your garden.
Mature height
12 inches (30.5 cm)
Width / spread
12 inches (30.5 cm)
Flower color
Blue
Foliage color
Green
Foliage type
Deciduous in cold climates
Growth rate
Moderate
Growth habit
Erected
Fragrance
Not documented for this selection
Bloom period
June-August
Garden associations
In goodcompany.
Companion plants
Consider these plant associations for Larkspur 'Summer Night': coneflowers, bellflowers, perennial geraniums. Choose varieties that tolerate sun to partial shade and comparable moisture; allow each clump its mature space.
Plants to avoid
Around ‘Summer Night’ larkspur, above all avoid neighboring plants that would cover its leaves or strongly compete with its root ball. Compatibility in terms of light, water, and spread takes precedence over a list of so-called enemy plants.
Frequently asked questions
Your questions,answered.
Where to plant Delphinium ‘Summer Night’?
Provide a sunny to semi-shady spot and suitable soil (humus-rich, retaining freshness during growth, with no stagnant water around the crown). Large delphinium spikes may require support in windy areas; plan for this before they are fully developed.
Where should I plant 'Summer Night' Larkspur?
Count on approximately 30 cm in height and 30 cm in width at maturity. Approximately 30 cm between centers, to be adjusted according to the actual development of the clump. This size is suitable for use as a low border and at the front of a bed.
When does Delphinium 'Summer Night' bloom?
The period indicated is June-August. The flower palette is blue. The exact date and duration depend on the climate, season, and plant establishment.
How to water and care for Delphinium ‘Summer Night’?
For Larkspur ‘Summer Night’, regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; this exposure (sun to partial shade) does not eliminate the need for water. After flowering, remove spent flower stalks above healthy foliage and continue watering as appropriate for the soil.
Can Larkspur 'Summer Night' be grown in a pot?
To try 'Summer Night' Larkspur in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (30 cm). The substrate should remain moist; it will dry out faster than in open ground. Plan for container protection in winter depending on your climate.
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