High Country Gardens
Blue Boy Dahlia
Best unique floral choice for gardeners seeking dramatic, long-lasting summer color.
Introducing the Blue Boy Dahlia, a rare lilac-blue semi-dinnerplate variety that brings dramatic color to your garden. Growing up to 40 inches tall, these flowers bloom from midsummer until frost, creating a stunning visual display. Perfect for mixing with pink, purple, or silver companions, they thrive in full sun and average soil. Hardy in zones 8-10, they can be treated as annuals in cooler climates. These tubers are also excellent for cut flowers, adding a unique hue to arrangements.
$23.99
Owner Satisfaction
4.6
/ 5
Category Rank
726
/ 3183
#726 in Plant & Flower Bulbs
Price vs Category Average
+2%
Above average
Ships As
Bulb, Rhizome, Tuber
/ Bulb, Rhizome, Tuber
Who it's for
- Gardeners seeking sophisticated color palettes for their landscape
- Floral designers creating long-lasting, dramatic indoor arrangements
- Landscapers wanting high-impact blooms throughout the late season
Who should skip it
- Cold-climate gardeners wanting low-maintenance, permanent garden fixtures
- Botanists specifically searching for true blue flower pigments
- Busy homeowners preferring hands-off, low-maintenance plant varieties
Performance breakdown
Visual Impact
Rare lilac-blue tones provide a sophisticated focal point for any garden.
Bloom Longevity
Consistent flowering from midsummer through the first frost extends seasonal interest.
Pollinator Appeal
Active nectar production reliably draws butterflies and hummingbirds to your landscape.
Floral Utility
Large dinnerplate blooms make for dramatic, long-lasting additions to cut arrangements.
Maintenance Ease
Upright growth habit requires staking to prevent damage during heavy winds.
Climate Versatility
Thrives as a perennial in warm zones but requires lifting in colder climates.
Key Specs
Ships As
Bulb, Rhizome, Tuber
Flower Size
6-8 inches
Mature Height
36-40 inches
Planting Depth
1 to 2 inches below soil line
Spacing
1 bulb/tuber per square foot
Hardiness Zones
8-10 (Perennial); Zones 3-7 (Annual)
USDA Hardiness Zones
Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9, Zone 10
Plant Life Cycle
Annual, Perennial
Features
- Striking lilac-blue semi-dinnerplate blooms
- Long blooming season from midsummer to frost
- Attracts butterflies and hummingbirds
- Ideal for cut flower arrangements
- Suitable for container planting
- Easy to grow and care for
- Upright growth habit, may require staking
- Rare and unique color for dahlias
What customers say
Customers consistently celebrate the exceptional quality and reliability of the Blue Boy Dahlia stock. The primary delight centers on the plant's stunning, unique lavender blue coloration, which provides a sophisticated focal point in the garden. Reviewers frequently mention the robust growth and prolific blooming throughout the season, confirming the plant delivers on its promise of dramatic visual impact. While some noted slight variations in the exact shade of blue, the overall consensus highlights superior performance and excellent value for a truly distinctive dahlia variety.
Know before you buy
Yes, because these dahlias grow up to 40 inches tall and produce large 6-8 inch blooms, they benefit from staking to keep the stems upright and prevent them from bending or breaking during heavy winds or rain.
Absolutely. These dahlias are well-suited for containers, provided you use a pot that is large enough to accommodate the tuber and has adequate drainage to keep the soil from becoming waterlogged.
In zones 3-7, treat the Blue Boy Dahlia as an annual. Alternatively, you can dig up the tubers after the first frost in autumn, store them in a cool, dry place over the winter, and replant them in the spring.
For the best performance and most vibrant color, plant these in a location that receives full sun, which means at least 6 to 8 hours of direct sunlight per day.
Yes, they are excellent for cut flower arrangements. Their unique lilac-blue color and large, semi-dinnerplate size make them a standout focal point in any vase.
Plant your tubers in the spring once the danger of frost has passed and the soil has begun to warm up. Aim for a planting depth of 1 to 2 inches below the soil surface.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$24