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Delphinium Grand. Summer Nights
Common Name: Summer Night Delphinium
Delphinium grandiflorum ‘Summer Nights’ is a compact, clump-forming perennial valued for its upright to slightly spreading form and rich deep violet-blue flowers that bloom over an extended period from late spring into summer, creating a vibrant display, with finely divided green foliage that may yellow and die back after flowering.
Mature Size:
Width: 12–18 in
Height: 12–18 in
USDA Zones: 3a–7b (best performance in cooler climates; more heat tolerant than tall delphiniums)
Light: Full sun to partial shade
Blooms: Deep violet-blue flowers from late spring into summer
Soil: Well-drained, moderately fertile soil
Water: Moderate; prefers consistent moisture
🌸 Landscape Uses
Perennial borders, edging, containers, rock gardens, mass plantings
🌼 Attracts & Tolerances
Attracts: Pollinators
Tolerances: Deer resistant, moderate heat tolerance
| Plant Type: | Perennial |
| Width: | 12-18" |
| Height: | 12-18'' |
| Fragrant: | Yes |
| Fruit: | Not verified |
| Zone: | 3–7 |
| Deer Resistant: | Not verified |
| Salt Tolerant: | Not verified |
| Drought Tolerant: | No |
| Attract: | Butterflies, Hummingbirds |
| Exposure: | Full Sun, Partial Shade |
| Bloom Time: | Late Spring, Spring |
| Landscape/Use: | Mass Planting, Border |
| Shape: | Clump, Compact |
| Soil Type | Loamy, Well Drained |
| Flower Color: | Blue |
| Leaf Color: | Green |
| Fall Color: | Green |