Delphinium chinensis 'Diamonds Blue'
Delphinium chinensis 'Diamonds Blue'

Delphinium chinensis 'Diamonds Blue'

SKU: F27443
1 for $16.00
Quick Facts
Common Name: Delphinium
Hardiness Zone: 5-7S/10W Exposure: Sun
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Blooms In: Jun
Mature Height: 16-24" Spacing: 12"
Read our Growing Guide Ships as: 1 PINT 28.86 CU IN.
Deer Resistance: Yes
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Shipping Details Shipment begins in early September 2024, depending on your zone. See shipping tab for details
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Product Details

Product Details

Delphinium chinensis 'Diamonds Blue' produces upward-facing, spurless, cerulean blue flowers that appear on first-year plants, sure to win your admiration. With a shorter than typical stature and good branching habit, 'Diamonds Blue' is a great choice for the middle or front of perennial borders or in mixed container plantings.

The tall hybrid Delphiniums are the outstanding elements of every well-bred garden. However, dwarf forms and the sturdy and graceful species are equally charming in their own way. Delphiniums require full sun and rich soil amended with lime. In the South, they are best planted in the fall and treated as cool-season annuals.

For more information on growing Delphinium, click Growing Guide.




The size of the plants we ship has been selected to reduce the shock of transplanting. For some, this means a large, bareroot crown. Others cannot travel bareroot or transplant best if grown in containers. We ship these perennials and annuals in 1 pint pots, except as noted. We must point out that many perennials will not bloom the first year after planting, but will the following year, amply rewarding your patience. We ship bulbs as dormant, bare bulbs, sometimes with some wood shavings or moss. Shrubs, Roses, vines, and other woody plants may be shipped bareroot or in pots. The size of the pot is noted in the quick facts for each item.


We ship our bulbs and plants at the right time for planting in your area, except as noted, with orders dispatched on a first-come, first-served basis by climate zone. We also ship a wide range of containers and planters, tools, supplies, fertilizers, garden wear, garden decor items, as well as indoor decorations like wreaths and dried bouquets when available. Estimated dates for shipping are indicated in the green Shipping Details box for each item. Please supply a street address for delivery. Kindly contact us with two weeks notice, if you'll be away at the expected time of delivery.


We guarantee to ship plants that are in prime condition for growing. If your order is damaged or fails to meet your expectations, we will cheerfully replace or refund it. Please contact our Customer Service Department at 1-800-503-9624 or email us at [email protected]. Please include your order number or customer number when contacting us.



Average Customer Rating: 4 out of 5 stars (4 Reviews) Write a Review

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Diamonds Blue delphinium

It bloomed almost immediately upon planting and continues to produce. Very attractive color. It is a great cut flower

14 of 14 people found this review helpful. Do you? yes no  Certified buyer

One of greatest flowering plants ever

With this beautiful blue delphinium you can achieve the gardener trifecta: Red, White and Blue on the 4th of July.

This plant is prolific in its flowers. It's not too tall and there are many major branches off the main branch. So it's full in the right places but doesn't become round.

The color is unique. My soil is heavy, and the plant still does well. Surprised it does so well in the heat, too. Highly recommend.

26 of 26 people found this review helpful. Do you? yes no  Certified buyer

Not what was expected

I was disappointed with the performance of this plant. It did not flower as shown in the picture nor did it return the following season. I assure you that it was placed in the correct area, soil amended with compost and watered. Hopefully, other customers had better luck.

21 of 23 people found this review helpful. Do you? yes no  Certified buyer

Delphinium delight!

This plant looked great in my garden. Looking forward to seeing how it will grow this year.

16 of 16 people found this review helpful. Do you? yes no  Certified buyer

Growing guide

Growing guide
Print Grow Guide

Latin Name Pronunciation: del-fin'ee-um 

Delphiniums require full sun, preferably in a spot protected from high winds. They also need very fertile soil, with a pH close to neutral. If your soil is acid, plan to mix a handful of lime into the bed. And, lastly, all of the tall varieties require staking. Inevitably, a sudden downpour will knock unsupported stems down into the mud, and there's no way to ease that heartbreak. We suggest using two or more loops of twine, arranged in a figure-8, starting near the base and ending just below the flower head.

"Very fertile soil" means soil enriched with plenty of compost or composted manure. Plan to add a balanced, slow-release fertilizer as well.

Yes, Delphiniums require more attention and preparation than some other perennials. But, as our founder wrote, "… no gardener worth his loam would stop growing Delphiuniums just because they are not as rugged as weeds. There is nothing more beautiful or more rewarding …."

Cut the flower stalks of all but D. grandiflorum 'Blue Mirror' to the ground immediately after flowering for a second, smaller show in September. D. grandiflorum 'Blue Mirror' is the best Delphinium for the South but is short-lived there; allow a few plants to go to seed to provide for replacements.

Combine with Peonies, Siberian Iris, Lupines, Shasta Daisies, Roses, and other June bloomers.

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