Species
Delphinium elatumTall Larkspur9 other cultivars
‘Double Blue’Delphinium 'Double Blue'
‘Magic Fountain Lavender’Larkspur
‘Summer Nights’Summer Nights Larkspur
‘Faust’Faust Delphinium
‘Purple Passion’Delphinium Purple Passion
‘Marble Delight’Marble Delight Delphinium
‘Blue Buccaneers’Blue Buccaneers Delphinium
‘Morning Lights’Morning Lights Delphinium
‘Dusky Maidens’Dusky Maidens Delphinium
The Story
Plant Bio
Tall, erect perennial with striking blue flowers on tall spikes.
Cultivar known for unusually rich cobalt-blue flowers.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
60 inches
Width
24 inches
Light
Full Sun
Zones
4, 5, 6, 7
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Europe and Asia
Toxicity
Toxic to humans and pets if ingested
Bloom period
Mid-summer – Late summer
In flower about 2 months of the year
Planting
How to Grow
- Tuck seeds into moist, well-draining soil in early spring for best germination.
- Water regularly to keep soil evenly moist during active growth.
- Thin seedlings to 12 inches apart once established to prevent overcrowding.
- Stake tall varieties to support their flower spikes and prevent damage.
- Apply a balanced fertilizer monthly during the growing season for lush growth.
- Deadhead spent flowers to encourage additional blooms.
Pro Tip
Plant in a sheltered spot with good air circulation to prevent fungal diseases.
Keep It Thriving
Care Guide
Do
- Water consistently, especially during dry spells 💧
- Mulch around plants to retain soil moisture and suppress weeds 🌱
- Prune after flowering to promote bushier growth
Don't
- Avoid overwatering to prevent root rot ❌
- Do not plant in heavy clay soil without amendments
- Refrain from disturbing roots during flowering
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Stake |
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
Cobalt Dreams Delphinium questions
What zones can Cobalt Dreams Delphinium grow in?
Cobalt Dreams Delphinium 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 Cobalt Dreams Delphinium deer resistant?
Yes — Cobalt Dreams Delphinium is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Cobalt Dreams Delphinium bloom?
Cobalt Dreams Delphinium typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Cobalt Dreams Delphinium need full sun?
Cobalt Dreams Delphinium does best in full sun (6+ hours).
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'
Summer Nights Larkspur
Delphinium elatum 'Summer Nights'
Faust Delphinium
Delphinium elatum 'Faust'
Pacific Giant Delphinium
Delphinium x belladonna 'Pacific Giant'
Keep exploring
Explore the genus
Hardy in your zone?
Grow Cobalt Dreams Delphinium 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.