Diamonds Blue Dwarf Delphinium

As low as $39.99 was $49.99
Availability: In stock

Big bold blooms that stand vertical in the garden, the Diamonds Blue Dwarf Delphinium (Delphinium grandiflorum 'Diamonds Blue') shoots up flouncy spikes of electrified lavender to lavender-blue blooms, each with a lovely pinkish-purple dot kissing each petal! These are lovely landing pads for butterflies and big focal points in the garden border and in the vase!

These perennial flowering plants form lovely mounds of heavily lobed, deep green leaves that are perfectly sized for tucking into any garden bed or border, or even containers for a dramatic blue vertical accent! The entire flower spike is covered in these single electrically hued blooms and is sure standouts for the landscape without sacrificing space.

Dwarf Delphinium is a hardy and cold-tolerant perennial that thrives throughout USDA growing zones 3 through 9. Usually, Delphinium grows to great heights, but Diamonds Blue is just a miniature version of the classic border plant! Growing to 18-24 inches in height when in bloom and spreading to 12-15 inches in width.

Planting and Application:

Classic Cottage garden and Perennial border plants, Delphinium thrive in hot dry locations and the blooms last for a long time as they open from the bottom up on each spike! Add to cut flower gardens for vivid bouquet additions, and add the waving blue wands to pollinator gardens for low height and interest! Plant with other Delphinium varieties for a gorgeous show every summer!

Diamonds Blue can easily add height and interest to patio pots, porch containers and big mixed planters of your seating areas in the sun! Pair with flowing grasses and groundcovers, include in Rose gardens and add interest to a Rock Garden with upright unearthly blue color! Create groupings among other landscape plants to add dramatic points of interest anywhere in the sun!

  • Frilly Lavender-Blue Petals With Purple Spots
  • Lobed Deep Green Foliage
  • Low-Maintenance Space-Saving Size
  • Pollinators, Cut Flowers & Containers
  • Accents, Low Focal Points, Rock gardens & Cottage borders

#ProPlantTips for Care:

Dwarf Delphinium are blissfully low-maintenance. These modern perennials boast strong stiff stems that rarely require staking if planted in a sheltered spot. Plant in the full sun for the strongest growth and in well-drained organically enriched soils. Provide regular yet moderate moisture throughout the growing season and add a 3-4 inch layer of mulch over the root zone for moisture retention and insulation. Encourage reblooming by trimming down the flowers as they near finishing. You'll enjoy another excellent display in late summer and fall if those first flowers are removed. In late fall, prune back the mound and water in well for the winter.

  • Full Sun
  • Moderate Yet Regular Moisture
  • Deadhead After Bloom & Prune in Late Fall
  • Appreciates Well-Drained Enriched Soil
  • Deer Resistant

Diamonds Blue Dwarf Delphinium is just the brilliant perennial for your garden bed or border that is sure to catch all the attention! No fuss and no muss classic garden beauty can be yours as soon as you order yours at today!

Buying Options for Plants

Nature Hills sells a large variety of plants with several options available. Plants are offered in both potted containers and as dormant bare root without soil. Here is a helpful resource to understand your options as you create a beautiful landscape with help from Nature Hills.

Ever wonder what a larger plant will mean for your landscape? Container Sizes are really all about the age of the plant!

Seasonally, Nature Hills offers hand selected, high quality bare root trees, shrubs and perennials. Bare root plants are sold by height from the top of the root system to the top of the plant. Plants may be taller than the height minimums.

  • Popular sizes of select trees are 1 foot, 2 feet, 3 feet, etc.
  • Popular sizes of select bare root plants is 1 foot, 18 inches, etc.

Nature Hills Container Size by Volume

Keep in mind, specific varieties and different growing conditions can affect the rate at which plants grow. Variations in size may occur.

Young Plants to 18 Months
Size Volume
2"x2"x3" Ranges from .18 to .21 dry quarts / .198 to .23 dry liters in volume
4.5" Container Equal to .65 dry quart / .72 dry liter in volume
Sprinter Pot Equal to .63 dry quart / .69 dry liter in volume
4" Container Ranges from .31 to .87 / .35 to .96 dry liter in volume
6" Container Equal to 1.4 dry quarts / 1.59 dry liters in volume
1 Quart Equal to 1 dry quart / 1.1 dry liter in volume
5.5" Container Equal to 1.89 of a dry quart / 2.08 dry liters in volume
4"x4"x5" Ranges from .8 to 1.1 dry quarts / .88 to 1.2 dry liters in volume
4"x4"x6" Ranges from 1.0 to 1.3 dry quarts / 1.1 to 1.41 dry liters in volume
4"x4"x9" Ranges from 1.1 to 2.1 dry quarts / 1.2 to 2.3 dry liters in volume
4"x4"x10" Ranges from 1.7 to 2.3 dry quart / 1.87 to 2.53 dry liters in volume
Plants 18 Months - 2.5 Years Old
Size Volume
2 Quart Equal to 2 dry quarts / 2.2 dry liters in volume
#1 Container Ranges from 2.26 to 3.73 dry quarts / 2.49 to 4.11 dry liters in volume
5"x5"x12" Equal to 3.5 to 4.3 dry quarts / 3.85 to 4.74 dry liters in volume
Plants 2 - 4 Years Old
Size Volume
#2 Container Ranges from 1.19 to 1.76 dry gallons / 5.24 to 7.75 dry liters in volume
#3 Container Ranges from 2.32 to 2.76 dry gallons / 10.22 to 12.16 dry liters in volume
Plants 3 - 5 Years Old
Size Volume
#5 Container Ranges from 2.92 to 4.62 dry gallons / 12.86 to 20.35 dry liters in volume
#6 Container Ranges from 5.25 to 6.01 dry gallons / 23.12 to 26.42 dry liters in volume
#7 Container Ranges from 5.98 to 6.08 dry gallons / 26.34 to 26.78 dry liters in volume

About Plant Sentry™

Plant Sentry is designed to protect both consumers and the nursery trade from invasive plant pests and diseases. Sites that display the Plant Sentry protection badge are protected from consumers buying and nurseries shipping material carrying invasive pests and diseases.

This proprietary eCommerce software prevents the shipment of a restricted plant to each state. The Plant Sentry system includes a shipment certification program. The Plant Sentry Compliance Officer works closely with and each nursery or fulfillment center to ensure only compliant plants are sold to customers.

Click Here to learn more

Plant Sentry


To obtain a more accurate shipment time-frame, simply enter your zip code in the “Find Your Growing Zone” box to the right. Our plants are grown all over the country and lead time on items may be different because of this. Once your order is placed, you will also receive the specific shipment time-frame information as part of your order confirmation. Once an item ships, you will receive shipment notification and tracking numbers, so you can follow along while your plant travels to your doorstep. We use FedEx, UPS, or USPS at our discretion.

Due to winter weather we have put a hold on shipping to the areas shown below in grey. You can still order now and we will ship the plant to you during an appropriate time for your zone.

*If you have found your zone already, it will be highlighted in the table below.
Color Zone Times
3 Spring 2019
4 Now
5 Now
6 Now
7 Now
8 Now
9 Now
10 Now
11 Now

Shipping Rates

At Nature Hills we handle, package and ship the products you order with the utmost care to ensure healthy delivery. Shipping and handling charges are calculated based on the tables below. Please note that some items include an additional handling surcharge, these will be noted on the item's product page.

From To S&H
0 - 19.99 24.99
20 - 49.99 29.99
50 - 69.99 34.99
70 - 99.99 39.99
100 - 129.99 44.99
130 - 149.99 48.99
150 - 150+ Approx 28%

Click here to see our full rates


Diamonds Blue Dwarf Delphinium Is Suited to Grow in Zones 3-9
Growing Zones 3-9
More Information
Brand Nature Hills' Choice
Botanical Name Delphinium grandiflorum Diamonds Blue'
Type Perennial
Mature Height 18 - 24 inches
Mature Spread 12 - 15 inches
Sun Exposure Full Sun
Soil Well Drained Soil
Moisture Medium
Growth Rate Medium
Flower Color Blue, Purple
Foliage Color Green
Fall Color Yellow
Pollinator Friendly Yes
Pruning Time Late Autumn
Fragrant Yes