Summer Blues Delphinium

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The pretty dwarf Summer Blues Delphinium (Delphinium grandiflorum 'Summer Blues') is blanketed with 1 -inch sky blue florets for a vivid display within the summer garden border! The sky-blue single blooms are held on slender stems all along each flower spike and are suspended loosely all along the entire flowering wand! Each lovely floret has a barely blue-to-white 'bee' at its center for added interest!

A wonderful dwarf cultivar, this herbaceous perennial flowering plant puts on quite the bright show all summer and into autumn - much to the delight of every butterfly and Hummingbirds in your area! Standing at a height of 10-12 inches tall and wide, Summer Blues is a dwarf Delphinium and forms compact mounds of well-branched foliage in early summer. The lush dark green leaves are deeply incised and lobed to be the perfect lacy backdrop for those unearthly blue blooms!

Summer Blues has better heat tolerance and is earlier blooming than other Delphiniums. But it displays the same deer and cold tolerance as the rest of this illustrious family! Small and space-saving, Dwarf Delphiniums are lovely gift plants and ideal for tucking into small yards, container gardens, or those bare spots within an established landscape with ease!

Planting and Application:

Summer Blues will flower in the first year, making it perfect for bedding, borders, and containers, and providing a colorful display over a long summer period! Traditional cutting garden plants and in groupings or rows throughout Perennial and Cottage borders, you'll add enchantment to walkways, paths, and any garden bed in your landscape with a classic blue Delphinium! These are delightful and fine-textured additions regardless of how much room you have available!

Summer Blues is a space-saving dwarf, and is great when used as edging, a bedding plant, or in containers combined with pastel-colored annuals, fine-textured spillers, and other wand-like blooms! They become the pinnacle focal point flower in mixed planters because of that gorgeous hue! Dress up a patio or front porch planter with elegant finery! The fine textured foliage becomes soothing greenery and fillers, even when the plant is not in flower! Any garden becomes a Butterfly garden with one or more of these frilly perennials!

  • Compact Spikes of Sky Blue Flowers & White Centers
  • Earlier Blooming & Long-Lasting
  • Deeply Incised Green Foliage
  • Space-Saving Mounds of Leaves
  • Light and Airy Texture, Accents, Specimens in Garden Beds, Borders & Containers

#ProPlantTips for Care:

Delphiniums grow best in full sun and afternoon shade, in locations with enriched, well-drained soil with a basic pH. If your soil is naturally acidic, adding lime will help to provide these conditions. Delphinium appreciates a 3-4 inch thick layer of mulch over the roots. Provide regular moisture all summer for best results and to support the huge blooms.

These dwarf-sized stems rarely need any staking when planted in a protected area, so they remain upright with no problem! But if you do grow them in windy locations, a firm stake will help support their stems. Deadhead early enough and you'll enjoy a rebloom until fall, then as the foliage turns yellow, prune back the mound close to the ground and water it in well one last time before the ground freezes.

They are also heavy feeders. The addition of compost or manure to the soil, as well as a granular fertilizer, will result in healthier, stronger plants. It is recommended you wear gloves when handling these plants since some can develop skin sensitivity. Always monitor young pets and young children around Delphinium.

  • Full Sun & Afternoon Shade
  • Well-Drained Enriched Soil
  • Appreciates Mulch & Regular Moisture Access
  • Deadhead As Blooms Fade & Prune Late Autumn
  • Low-Maintenance, Deer & Heat Tolerant

Powdery sky blue drifts of blooms on a dwarf space-saving perennial, the Summer Blues Delphinium will become your new favorite flower this year! Hurry and order yourself or someone special one of these easy-to-care-for bloomers today from!

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.

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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
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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


Summer Blues Delphinium Is Suited to Grow in Zones 3-7
Growing Zones 3-7
More Information
Brand Nature Hills' Choice
Botanical Name Delphinium grandiflorum 'Summer Blues'
Type Perennial
Mature Height 10 - 12 inches
Mature Spread 10 - 12 inches
Sun Exposure Full Sun
Soil Well-Drained
Moisture Moderate
Growth Rate Medium
Flower Color Blue
Pollinator Friendly Yes
Pruning Time Late Autumn