An attractive dwarf perennial covered in a blanket of dainty midnight-blue flowers over along flowering period. Height 30cm. Spread 20cm. Flowers June to September. Full sun. Fertile, moist, well-drained soil. Hardy. Attracts bees.
Delphinium grandiflorum ‘Summer Nights’ is a charming dwarf perennial that produces masses of dainty midnight-blue flowers above lacy green foliage. Growing to around 30cm in height and 20cm in spread, it is perfect for borders, containers, and pollinator-friendly planting schemes. Flowering from June to September, this hardy perennial adds long-lasting colour to summer gardens while attracting bees.
PLANTING and AFTERCARE GUIDE
Best Planting Time
Spring: Plant Delphinium grandiflorum ‘Summer Nights’ in spring when the soil is warming. This allows the plant to establish strong roots ahead of the flowering season.
Autumn: Planting in early autumn gives the roots time to settle before winter, encouraging healthy growth the following year.
Site Selection
Sunlight: Delphinium grandiflorum ‘Summer Nights’ thrives in full sun. Select a site with at least 6 hours of direct light daily to maximise flowering.
Soil: Choose fertile, moist but well-drained soil. Incorporate organic matter such as compost to enrich the soil and enhance drainage.
Planting Instructions
Prepare the Hole: Dig a hole twice as wide and the same depth as the root ball.
Soil Preparation: Mix compost or well-rotted organic matter into the soil for nutrients and structure.
Planting: Position Delphinium grandiflorum ‘Summer Nights’ so the crown is level with the soil surface. Backfill and gently firm the soil.
Watering: Water thoroughly after planting to settle the soil and encourage root establishment.
Watering Requirements
Growing Season: Keep the soil evenly moist, watering during dry spells. Avoid waterlogging, which can damage roots.
Dormant Season: Reduce watering significantly, only watering if the soil becomes excessively dry.
Feeding
Spring: Apply a balanced fertiliser at the start of the season to boost early growth.
Summer: A light liquid feed during the flowering season will encourage continuous blooms and healthy foliage.
Pruning
Deadheading: Regularly remove spent flowers to prolong the blooming period and maintain a neat appearance.
Autumn Cut Back: At the end of the season, cut back Delphinium grandiflorum ‘Summer Nights’ to ground level to prepare it for dormancy.
Mulching
Spring: Apply a mulch of organic material such as compost or bark chips to retain soil moisture and suppress weeds.
Winter: A protective mulch layer will insulate roots and reduce the impact of frost.
Supporting the Plant
Due to its compact size, Delphinium grandiflorum ‘Summer Nights’ typically does not need staking. However, in very exposed sites, light support can be beneficial.
Final Tips
Delphinium grandiflorum ‘Summer Nights’ is a low-maintenance perennial ideal for adding bold splashes of midnight-blue to summer borders and pots. With proper care, this bee-friendly plant will thrive season after season, rewarding you with long-lasting blooms from early summer through to autumn.
Select options 
Josephine (verified owner) –
David E. (verified owner) –
Fast delivery and the plants was a good size almost in flower
David E. (verified owner) –
Very pleased with the quality of flowers, prompt service
Angela Simpson (verified owner) –