Light Needs
Mature Height
Mature Spread
Growing Zones
Cobalt Dreams Larkspur, botanically known as Delphinium ‘Cobalt Dreams’, features cobalt blue flowers with bright white, contrasting center ‘bees’. The flowers are packed on tall, strong stems, creating a show-stopping, architectural presence in any garden setting. Cobalt Dreams Larkspur was bred to have exceptional form, sturdiness, and flowering with greater tolerance to heat and humidity. Plant these stately, tall, blue beauties as a single specimen or en masse for a unique, eye-catching display.
Cobalt Dreams Larkspur has exceptional cold tolerance and is grown in Hardiness Zones 3-8, reaching heights of 4-6 ft and spreads of 18-24 inches. This deer- and rabbit-resistant perennial is bee friendly and attracts butterflies and hummingbirds. Use Cobalt Dreams Larkspur in many ways, including as a tall focal point in garden beds and in mass plantings, for a stunning effect.
Cobalt Dreams Larkspur Care
Larkspur thrives in full sun and in well-draining soil that is rich in organic matter. Water regularly, particularly in the heat of the summer, to keep the soil evenly moist. Because of its mature height of 4-6 ft., it may be necessary to stake it when in full bloom. Deadheading to remove spent flowers will promote and extend blooming.
To promote healthy, sturdy growth, prune Larkspur back to one-third its size in early spring. Cobalt Dreams Larkspur can be divided and transplanted either in the spring or fall. Apply a layer of organic mulch around the root zone in winter to protect it from harsh freezing weather; reapply a thin layer in spring to retain soil moisture and suppress any weeds.
Cobalt Dreams Larkspur Spacing
When planting in mass groupings, space Cobalt Dreams Larkspur 2 ft or more apart, measured center on center, to allow for its mature width.
Cobalt Dreams Larkspur Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 3 to 8 (perennial); grown as an annual elsewhere (outdoors year-round); grown indoors elsewhere (outdoors year-round); grown in containers elsewhere (grown as a seasonal crop)
- Sun Exposure
- Part Sun to Full Sun (5+ Hours Direct Sun)
- Mature Height
- 4-6 Feet
- Mature Spread
- 1-2 Feet
- Growth Habit
- , Upright
- Water Needs
- Consistently Moist
Flowers & Foliage
- Flower Colors
- , Blue
- Flower Description
- Blue
- Bloom Time
- Late Spring to Early Summer
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering, Fall Flowering
Garden Benefits
Plant Overview
- Common Name
- Cobalt Dreams Larkspur
- Also Known As
- Cobalt Dreams Larkspur
- Botanical Name
- Delphinium 'Cobalt Dreams'
- Plant Type
- Perennial
Simple Plant Spacing Calculator
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2026 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!