Diamonds Blue Delphinium
Best compact perennial for gardeners seeking vibrant, pollinator-friendly floral accents.
The Diamonds Blue Delphinium is a magnificent herbaceous perennial offering electric blue flowers with violet overtones on a mounded plant structure. It provides a fine, delicate texture ideal for smaller garden spaces, containers, and borders. This variety blooms from early summer into early fall, attracting pollinators, butterflies, and birds. It grows to about 16 inches tall and 12 inches wide, maintaining dark green, crinkled foliage throughout the season. While generally low maintenance, it requires cutting back in the fall. Be aware that parts of this plant are known to be toxic to humans and animals.
$10.99
Owner Satisfaction
4.5
/ 5
Category Rank
1601
/ 2769
#1601 in Flowers
Price vs Category Average
-73%
Below average
Mature Height
20
/ inches
Who it's for
- Gardeners seeking height and architectural impact in flower beds
- Homeowners wanting a long-lasting, multi-season floral display
- Floral enthusiasts who enjoy arranging fresh stems indoors
Who should skip it
- Gardeners lacking the time for consistent structural support
- Busy gardeners preferring low-maintenance, hands-off plant varieties
- Beginners discouraged by frequent pest and disease management
Performance breakdown
Visual Impact
Electric blue blooms provide a striking, high-contrast focal point.
Pollinator Attraction
Reliably draws butterflies and birds to your garden throughout summer.
Space Efficiency
Compact mounded habit fits perfectly in containers and small borders.
Maintenance Ease
Generally low effort, though seasonal cutting back is required.
Hardiness Range
Exceptional cold tolerance thrives even in harsh zone 2a climates.
Safety Profile
Toxicity concerns require careful placement away from pets and children.
Key Specs
Mature Height
20 inches
Mature Width
12 inches
Light Requirement
Full Sun
Bloom Time
Early Summer to Early Fall
Growth Rate
Medium
Hardiness Zone
2a
Water Needs
Average to Moist
Propagation Method
Division
Features
- Displays electric blue flowers with violet overtones
- Mounded plant habit is perfect for smaller garden areas
- Flowers are suitable for cutting arrangements
- Provides fine and delicate texture to garden compositions
What customers say
Customers consistently celebrate the exceptional quality and visual impact of the Diamonds Blue Delphinium. Reviewers frequently note the stunning, true blue color that provides a dramatic focal point in the garden. The plants arrive healthy and establish quickly, demonstrating excellent nursery stock reliability. This robust performance and vibrant design make them a highly valued addition for gardeners seeking reliable, showstopping color.
Know before you buy
This plant requires full sun to perform its best. Ensure it is placed in an area that receives at least six to eight hours of direct sunlight daily.
Yes, its compact, mounded habit makes it an excellent choice for containers. Its 12-inch width allows it to fit comfortably in smaller pots or as part of a mixed arrangement.
The Diamonds Blue Delphinium is relatively low maintenance, but it does require a hard cutback in the fall. This helps the plant prepare for dormancy and encourages healthy growth the following season.
Yes, please note that this plant is toxic to both humans and animals if ingested. It is best to plant it in a location away from curious pets or small children.
Absolutely. The electric blue flowers are well-suited for cutting and can add a delicate, vibrant touch to indoor floral displays.
This delphinium prefers average to moist soil conditions. Check the soil regularly and water whenever the top inch begins to feel dry to the touch.
Still have a question?
Ask Hayley anything about this product before you decide.
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$11