Blue Mirror Delphinium

Delphinium grandiflorum 'Blue Mirror'

$34⁸⁶

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#1 Container

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Understanding Plant Options

Nature Hills offers plants in two main formats:

Container Plants: Grown in pots with soil, sized by container volume and plant age
Bare Root Plants: Dormant plants without soil, sized by height measurements

Container Plant Sizes

Container sizes indicate plant age and growing capacity rather than liquid volume equivalents. Our containers follow industry-standard nursery "trade gallon" specifications, which differ from standard liquid gallon measurements.

Young Plants (6 months to 18 months old)

Container Size	Actual Volume	Metric Equivalent
2" x 2" x 3"	0.18 - 0.21 dry quarts	0.20 - 0.23 dry liters
4" Container	0.31 - 0.87 dry quarts	0.35 - 0.96 dry liters
4.5" Container	0.65 dry quarts	0.72 dry liters
6" Container	1.4 dry quarts	1.59 dry liters
1 Quart	1 dry quart	1.1 dry liters
5.5" Container	1.89 dry quarts	2.08 dry liters

Established Plants (18 months to 2.5 years old)

Container Size	Actual Volume	Metric Equivalent
2 Quart	2 dry quarts	2.2 dry liters
#1 Container	2.26 - 3.73 dry quarts	2.49 - 4.11 dry liters
5" x 5" x 12"	3.5 - 4.3 dry quarts	3.85 - 4.74 dry liters

Mature Plants (2-4 years old)

Container Size	Actual Volume	Metric Equivalent
#2 Container	1.19 - 1.76 dry gallons	5.24 - 7.75 dry liters
#3 Container	2.15 - 2.76 dry gallons	8.14 - 12.16 dry liters

Large Plants (3-5 years old)

Container Size	Actual Volume	Metric Equivalent
#5 Container	2.92 - 4.62 dry gallons	12.86 - 20.35 dry liters
#6 Container	5.25 - 6.01 dry gallons	23.12 - 26.42 dry liters
#7 Container	5.98 - 6.53 dry gallons	26.34 - 28.76 dry liters

Bare Root Plants

Bare root plants are sold by height from the root system to the top of the plant. Plants may exceed minimum height requirements.

Common Sizes:

Trees: 1 foot, 2 feet, 3 feet, 4 feet, 5 feet, 6 feet
Shrubs & Perennials: 1 foot, 18 inches, 2 feet

Important Notes

Container Volume Specifications

Trade Gallon Standard: Our containers follow industry-standard "trade gallon" specifications established by the American National Standards Institute (ANSI Z60.1) for nursery stock
Volume Variations: Actual soil volume may vary due to plant root systems and growing medium settlement
Age Indicators: Container size primarily indicates plant age and maturity rather than liquid volume equivalents

Growing Conditions

Plant size can vary based on variety and growing conditions
Container size helps indicate plant maturity and establishment level
Larger containers generally mean more established root systems and faster landscape establishment

Seasonal Availability

Bare root plants are available seasonally when dormant
Container plants are available throughout the growing season
Specific varieties may have limited availability in certain sizes

Questions?

For questions about specific plant sizes or availability, please contact our plant experts who can help you choose the right size for your landscape needs.

Plant Profile & Growing Essentials

Cold hardy, Flowering, Deer-resistant, Attracts pollinators, and Container Friendly

Specifications

Botanical Name

Delphinium grandiflorum 'Blue Mirror'
Height

1-2 ft
Width

1-2 ft
Growing Zones

3-7
Sunlight
- Full sun
- Partial shade
Growth Rate

Moderate
Flower Color
- Blue
Leaf Color
- Green
Pollinator Friendly

Yes
Bloom Period

Late Spring, Early Summer, Late Summer
Does Not Ship To

AK, HI, ID, MT

Planting & Care Instructions

Where to Plant

Sunlight: Provide at least 6 hours of direct sun daily for the best flower density. In hotter climates, morning sun followed by afternoon shade is ideal to prevent the intense blue petals from bleaching or wilting in the heat.
Soil: Aim for rich, well-draining soil that holds moisture without becoming soggy. If you have heavy clay, mix in plenty of compost to improve drainage, or add organic matter to sandy soil to help it retain the nutrients these heavy feeders require.

Watering Requirements

Keep the soil consistently moist like a wrung-out sponge during the first growing season to help the plant establish a deep root system. While mature plants can handle brief dry spells, inconsistent watering often leads to smaller blooms and stressed foliage. Aim for deep soakings at the base of the plant rather than frequent light sprinklings to encourage resilience.

Pruning Tips

Blue Mirror Delphinium blooms on new wood, so you should remove spent flower spikes promptly to trigger a second round of blossoms. Cut the stems back to the topmost leaves once the initial flowers fade to redirect the plant's energy away from seed production. Think of this like a mid-season haircut that keeps the plant compact and encourages a fresh flush of color in late summer.

Fertilizer Needs

Apply a balanced, slow-release fertilizer in early spring just as the new green growth begins to emerge from the soil. Avoid using high-nitrogen fertilizers late in the growing season because this promotes tender, leafy growth that cannot handle the winter cold. Focus on phosphorus-rich blends if you want to maximize the intensity of the electric blue flowers.

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Growing Zones 3-7

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Blue Mirror Delphinium: Compact Bold Blue Color!

Gorgeous blue wands of romantic color, the Blue Mirror Delphinium (Delphinium grandiflorum 'Blue Mirror') is a compact Chinese Delphinium that dazzles with intense cobalt-blue blooms and a long-lasting floral display. Unlike traditional tall Delphiniums, Blue Mirror features a compact, bushy habit, making it perfect for smaller spaces, borders, and containers.

This hardy perennial blooms repeatedly from late spring through summer, offering a reliable burst of color.

Native to China, this species is known for its finely cut foliage mounds and prolific, richly colored blooms, adding a touch of elegance and drama to any garden setting.

>>Jump to Planting & Care Instructions

Key Features of Blue Mirror Delphinium

Brilliant cobalt-blue flowers with distinctive cup-shaped petals.
Compact, bushy growth habit, reaching 12-24 inches tall and 12-18 wide
Blooms from late spring through summer, with repeat flowering.
Native to China, offering a unique alternative to taller varieties.
Attracts butterflies and pollinators, enhancing garden biodiversity.
Deer and rabbit resistant for worry-free planting.
Hardy in USDA Zones 3-7, thriving in a wide range of climates.
Low-maintenance and highly adaptable.

How to Use Blue Mirror Delphinium in the Landscape

Compact Cottage Gardens & Perennial Borders

Plant in mixed borders and Cottage Gardens for a splash of bold blue.
Combine with Coreopsis, Dianthus, or Shasta Daisies for a beautiful color contrast.
Use in group plantings for a striking mass of blue flowers.

Pollinator-Friendly Gardens

Attract butterflies, bees, and other beneficial pollinators with its nectar-rich blooms.
Include in wildlife-friendly garden designs for season-long interest.

Containers & Patio Displays

Perfect for small spaces, Blue Mirror thrives in containers and patio gardens.
Pair with ornamental grasses or trailing annuals for a layered effect.

Rock Gardens & Front-of-Border Plantings

Compact size makes Blue Mirror an excellent choice for rock gardens or front-of-border plantings.
Use as a filler plant to soften edges and create a cohesive look.

Cut Flower Gardens

Guardian Delphinium Mix is a favorite for cut flower arrangements with its long-lasting blooms and sturdy stems.
Harvest early in the morning for the freshest blooms.

Delphinium Care & Maintenance

These are easy-to-grow perennial plants that are a delight to have in your garden!

Sun & Soil Requirements

Prefers full sun, though it can tolerate light shade in hotter climates.
Requires well-drained, moderately fertile soil for optimal growth.

Watering & Mulching

Keep soil evenly moist, especially during the hottest parts of the growing season.
Add a 3-4 inch deep layer of mulch around the base to retain moisture and reduce competition from weeds.

Fertilizing

Feed with a balanced, slow-release fertilizer in early spring to support vigorous growth and flowering.

Deadheading & Pruning

Deadhead spent blooms to promote continuous flowering.
Cut back after the first flush to encourage a second round of blooms later in the season.

Winter Care

Very cold-hardy and easy to grow, Blue Mirror tolerates cold winters well. Apply mulch in late fall to protect the root zone.

Order Blue Mirror Delphinium Today!

Bring stunning cobalt-blue color to your garden with Blue Mirror Delphinium, a compact and versatile Chinese Delphinium. Its long bloom season, low-maintenance nature, and pollinator-friendly appeal make it a must-have for any garden enthusiast.

Order now from Nature Hills Online Plant Nursery, and enjoy months of brilliant blue blooms in your landscape!

Frequently Asked Questions About Blue Mirror Delphinium

How tall does Blue Mirror Delphinium grow?

Blue Mirror grows to 12-24 inches tall and the foliage mounds spread 12-18 inches wide, making it perfect for small-space gardens.

When does Blue Mirror Delphinium bloom?

It blooms from late spring through summer, with repeat flowering after deadheading.

Is Blue Mirror Delphinium deer-resistant?

Yes! Blue Mirror is deer and rabbit-resistant, making it a great choice for areas with wildlife pressure.

Can Blue Mirror be grown in containers?

Absolutely! Its compact size and bushy habit make it an ideal choice for patio pots and container gardens.

Does Blue Mirror Delphinium rebloom?

Deadhead spent flowers regularly and cut back after the first bloom to encourage a second flush later in the season.

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

Blue Mirror Delphinium

Delphinium grandiflorum 'Blue Mirror'

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