Summer Nights Larkspur
Delphinium elatum 'Summer Nights'
Essentials
At a Glance
Plant Type
Perennial
Height
48 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7
Water
Moderate
Humidity
Prefers moderate humidity
Lifespan
Perennial
Native To
Europe and Asia
Toxicity
Toxic to humans and pets if ingested
The Story
Plant Bio
Tall perennial with attractive spires of flowers. A member of the New Millennium series, this cultivar is prized for its sturdy stems and stunning, deep midnight-blue flowers, often with a white bee.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Choose a sunny location with well-draining soil for planting.
- Tuck seeds just below the soil surface and water gently, keeping soil moist.
- Provide consistent watering during the growing season to prevent stress.
- Fertilize monthly with a balanced, water-soluble fertilizer for vibrant blooms.
- Stake taller varieties to support their stems and prevent wind damage.
- Mulch around the base to retain moisture and suppress weeds.
Pro Tip
Plant in early spring for best growth; deadhead spent flowers to encourage more blooms.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil evenly moist 💧
- Fertilize monthly during the growing season 🌱
- Stake tall varieties to prevent flopping
Don't
- Avoid overwatering, which can cause root rot ❌
- Do not let the soil dry out completely between watering
- Avoid pruning in late fall to protect overwintering buds
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Prune | ||||||||||||
| Stake | ||||||||||||
| Winter Prep |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Summer Nights Larkspur questions
What zones can Summer Nights Larkspur grow in?
Summer Nights Larkspur is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Summer Nights Larkspur deer resistant?
Yes — Summer Nights Larkspur is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Summer Nights Larkspur bloom?
Summer Nights Larkspur typically blooms in early summer through mid-summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Summer Nights Larkspur need full sun?
Summer Nights Larkspur does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Delphinium to compare
Delphinium 'Double Blue'
Delphinium elatum 'Double Blue'
Larkspur
Delphinium elatum 'Magic Fountain Lavender'
Belladonna Delphinium
Delphinium x belladonna 'Dark Blue Dark Bee'
Faust Delphinium
Delphinium elatum 'Faust'
Pacific Giant Delphinium
Delphinium x belladonna 'Pacific Giant'
Tall Larkspur
Delphinium elatum
Keep exploring
Explore the genus
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Hardy in your zone?
Grow Summer Nights Larkspur with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
