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Delphinium 'Diamonds Blue'
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  • delphinium-diamons-blue-vase

Delphinium 'Diamonds Blue'

Regal rich deep blue-great for cuts!
Item: #DELDB1Q
ZONE 3,4,5,6,7,8,9
As low as $12.19
  • Magnificent perennial with regal blue blooms
  • Excellent for bouquets
  • Loved by butterflies and hummingbirds
  • Ultra hardy to zone 3
  • Grows 23" tall and 18" wide
  • Ship size: Jumbo 1 quart pots
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Delphinium 'Diamonds Blue' Description

Diamonds Blue delphinium is a favorite pollinator plant and a welcome addition to the perennial garden with their elegant spires of rich blue blooms, a color rarely found in other perennials. Delphinium begins to flower at the start of summer. Diamonds blue has an additional spot of purple on each petal.  Spires are well presented on top of delicate lacy green foliage. 

Very different from the stately and towering English delphinium which have proven troublesome and difficult to grow.  This new hybrid is  ore adaptable and growing only 18-23" tall so it requires no staking on your part. 

A must-have cut flower you will keep your vases full and fresh by cutting to encourage wonderful repeat blooms later in the season.

How to grow delphinium

Delphinium need at least 1/2 day sun (especially in the south) with consistent moist soil that is well-drained. They are heavy feeders and best to side dress with Osmocote in spring.   Protect from exposed locations. Delphiniums generally live about 2-3 years, but worth growing for their stately nature.

Designing with delphinium

Pair with other late spring/early summer blooming perennials such as:  euphorbias, tiarellas, heucheras, iberis, phlox subulata. Spring bloomers tend to lack vertical interest. Their spiky habit combine well with low mounded perennials such as iberis, groundcover sedums, dianthus, or lavenders.  

Special features: Attracts butterflies, Containers cut flower, Everblooming, Attracts hummingbirds, Long blooming, Reblooming, Season extender

Quick Facts

  • Botanical name:
    Delphinium grandiflorum 'Diamonds Blue'
  • Common name:
    Delphinium, Larkspur,
  • Zone:3,4,5,6,7,8,9,
  • Sun exposure:
    Sun, Part shade
  • Delivery:
    See Schedule
  • Ship form:
    1 quart
  • Soil type:
    Normal, Moist
  • Soil moisture:
    Average, Moist
  • Height x width:
    23" X 18"
  • Flower color:
  • Foliage color:
  • Bloom season:
  • Uses:
    Accent, Border, Cottage gardening, Foundation planting, Massing, Naturalizing, Specimen,
  • Cannot ship to:
    AK, HI
  • Patent #:



Soil: Well-drained, consistently moist soil
Light: Full sun
Water: Best to keep moist - do not dry out.
Spacing: 1.5 - 2 feet. Fertilizing: Delphinium are heavy feeders. Use Osomocote before new growth begins in spring.
Winterizing: Mulch roots in cold regions for protection
Maintenance & pruning: Dead-head after first flush is finished for repeat blooms later in the season.


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Janie M  |  May 18, 2018
I am very pleased and surprised by the size and healthy condition of the plants I ordered. I will be ordering again! Thank you