Delgenius™ Shelby Delphinium
Delphinium 'Delgenius Shelby'
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Delgenius™ Shelby Delphinium - #1 Container is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Delivery and Shipping
Fast, Safe Plant Delivery
Ships in 3-4 business days • Tracking provided • Weather protected
| Under $50 | $9.99 |
| $50 - $99.99 | $14.99 |
| $100 - $149.99 | $16.99 |
| $150+ | $24.99 |
✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee
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 Highlights
Delgenius™ Shelby Delphinium highlights at a glance!
Specifications
Specifications
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Brand
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Botanical Name
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Growing Zones
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Mature Height
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Mature Spread
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Sun ExposureFull Sun
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Moisture
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Soil
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Growth RateMedium
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Flower Color
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Pollinator Friendly
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Pruning Time
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Bloom PeriodLate Spring, Summer
Growing Zones
Proven Winners® Delgenius™ Shelby Delphinium
Gorgeous packed spires, the Delgenius™ Shelby Delphinium PP#34657 (Delphinium 'Delgenius Shelby') is a spectacular reblooming perennial known for its brilliant deep blue blooms with full, densely packed flower spikes. Rising high on tall sturdy stems over a mound of lacy deeply incised green foliage, these are eye-catching blossoms!
A standout in the Delgenius™ series, Shelby combines superior branching, heat tolerance, and cold hardiness, making it an excellent choice for gardens across many climates. Unlike traditional Delphiniums, Shelby offers continuous blooms from early summer to fall with a compact, sturdy form that requires no staking.
>>Jump to Planting & Care Instructions
Key Features of Delgenius™ Shelby Delphinium
- Stunning deep blue blooms on tall, full flower spikes.
- Extended bloom season, reblooming from early summer to fall.
- Superior branching habit for maximum flower production.
- Compact and sturdy, reaching 24-30 inches tall with no need for staking.
- Cold hardy to USDA growing zones 3-9, are heat tolerant and widely adaptable.
- Pollinator-friendly, attracting butterflies and bees.
- Perfect for cut flowers with long-lasting blooms.
- Deer and rabbit resistant for worry-free planting.
How to Use Delgenius™ Shelby Delphinium in the Landscape
- Cottage Gardens & Perennial Borders
- Plant Shelby in mixed borders to add vertical interest and bold color.
- Combine with Roses, Coneflowers, or Coreopsis for colorful Cottage Gardens.
- Use in mass plantings for a striking visual impact throughout the growing season.
- Pollinator Gardens
- Attract butterflies and bees with Shelby's nectar-rich blooms.
- Include it in pollinator-friendly landscapes for season-long beauty and ecological benefits.
- Container Gardening & Patio Displays
- Shelby's compact habit makes it perfect for large containers.
- Place on patios or decks to enjoy its vibrant blooms up close.
- Cut Flower Gardens
- Its tall, sturdy stems make it an ideal addition to fresh bouquets.
- Cut back after the first bloom to encourage additional flowers for later in the season.
Delphinium Care & Maintenance
Delphinium are very easy to grow and hardy perennial plants!
Sun & Soil Requirements
- Grows best in full sun to partial shade. Ensure at least 6 hours of direct sunlight for optimal blooms. Hot climates will find their plants do better with afternoon shade.
- Prefers an enriched, well-drained soil with consistent moisture.
Watering & Mulching
- Keep soil evenly moist, especially during hot, dry periods.
- Add 3-4 inch layer of mulch around the base to help retain moisture and regulate temperature.
Fertilizing
- Apply a balanced, slow-release fertilizer in early spring and again after the first bloom to promote continuous flowering.
Pruning & Deadheading
- Deadhead spent blooms to encourage reblooming.
- After the first flush of flowers, cut back the flower stalks to promote a second bloom cycle.
Winter Care: Shelby is cold hardy! Apply mulch or compost over the area in late fall to protect the root zone during harsh winters.
Order Delgenius™ Shelby Delphinium Today!
Bring vivid color and vertical beauty to your garden with Delgenius™ Shelby Delphinium. With its extended bloom season, compact habit, and reliable performance, Shelby is a must-have for any perennial garden.
Order now from Nature Hills Online Plant Nursery, and enjoy months of stunning blooms and low-maintenance beauty in your landscape!
Frequently Asked Questions About Delgenius™ Shelby Delphinium
How tall does Delgenius™ Shelby Delphinium grow?
Shelby grows to 20-24 inches tall and spreads to about 16-20 inches wide, making it easy to include in mixed borders, mass plantings, and containers.
When does Delgenius™ Shelby Delphinium bloom?
It blooms continuously from early summer through fall, with a second bloom cycle after deadheading.
Is Delgenius™ Shelby Delphinium deer-resistant?
Yes! Delgenius™ Shelby is resistant to deer and rabbits, making it a great choice for gardens with wildlife pressure.
Can I grow Shelby in a container?
Absolutely! Shelby's compact, sturdy form makes it perfect for patio pots and large containers.
How do I promote continuous blooming?
Deadhead spent blooms and cut back flower stalks after the first bloom to encourage a second flush of flowers later in the season.
Is Delgenius™ Shelby Delphinium easy to grow?
Yes! Shelby is widely adaptable, low-maintenance, and more heat-tolerant than traditional Delphiniums.
