How to Grow Chantilly Purple
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Chantilly Purple
Dahlia × hybrida 'Chantilly Purple'
flowerChantilly Purple is a stunning decorative dahlia cultivar featuring full, layered double blooms in deep purple with a velvety texture. This medium to tall variety produces abundant flowers throughout the growing season, making it an excellent choice for cut flowers and garden displays. The plants develop robust foliage and bloom prolifically from mid-summer until the first frost.
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Example Chantilly Purple timeline · Pittsburgh, PA (Zone 6b)
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Plant Chantilly Purple
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Chantilly Purple blooms
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Chantilly Purple dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-10; tubers dug and stored indoors in zones colder than zone 8
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Sprouting
2-3 weeksTubers develop shoots at the eyes; seedlings emerge with first true leaves
Keep soil warm (60-65°F) and moist. Plant tubers after last frost when soil warms. Support seedlings with gentle light.
Vegetative Growth
4-6 weeksPlants develop leafy stems and establish root systems; heights of 12-24 inches depending on pinching
Pinch out growing tips when plants reach 12 inches tall to encourage bushier growth and more flowers. Stake taller varieties. Feed with balanced fertilizer monthly.
Budding
3-4 weeksTerminal flower buds appear and clusters form at stem tips; buds develop and swell noticeably
Continue regular watering and feeding with lower-nitrogen, higher-phosphorus fertilizer to support flowering. Remove lower leaves to improve air circulation.
Flowering
8-12 weeks until frostFull, deep purple double blooms with layered petals open; flowers are 4-6 inches in diameter with velvety texture
Deadhead spent flowers to encourage continuous blooming. Ensure consistent moisture and weekly feeding. Cut flowers early morning for arrangements. Watch for pests during peak bloom.
Dormancy/Storage
Winter monthsPlants blacken and collapse with first hard frost; tubers go dormant underground
In zones below 8, cut back foliage after frost, carefully dig tubers, wash, dry, and store at 40-50°F in peat moss or sawdust. In warmer zones, mulch heavily or allow in-ground overwintering.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Handpick early morning; use neem oil or insecticidal soap; plant French marigolds nearby as repellent
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Increase humidity with misting; use miticide if severe; improve air circulation
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Handpick in early morning; use beetle traps nearby (not directly on plants); apply neem oil in evening
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Remove infested flowers; use insecticidal soap or spinosad; encourage beneficial insects
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Improve air circulation; avoid wetting foliage; apply sulfur or fungicide at first sign; remove affected leaves
Uses
Edible Flowers
CulinaryDahlia petals are edible with a slightly sweet, tuber-like flavor and are used as garnishes in salads, on cakes, and in gourmet cuisine. Some dahlia tubers (from food-specific cultivars) are also eaten as a starchy vegetable in some cultures. [source]
Cut Flowers & Arrangements
CraftChantilly Purple's large, fully double blooms and long stems make it ideal for cut flower arrangements, wedding bouquets, and floral design. The velvety purple color is particularly striking in mixed arrangements and lasts well in a vase. [source]
Garden Display & Ornament
HouseholdThis dahlia's abundant flowering and attractive form make it an excellent choice for beds, borders, and containers, providing color from mid-summer through fall frost. It serves as a focal point or massing plant in perennial gardens. [source]
Pollinator Support
WildlifeDahlia flowers attract bees, butterflies, and other pollinators, providing valuable nectar and pollen sources during late summer and fall when other flowers may be scarce. [source]
Harvest Tips
Cut flowers in early morning when stems are fully hydrated and blooms are just fully open. Use sharp pruners and cut at a 45-degree angle. Remove lower leaves from cut stems and place immediately in water with floral preservative. Dahlias last 5-10 days in a vase. Continue deadheading throughout the season to promote more blooms.
Fun Facts
- 🌱 Dahlias are native to Mexico and were cultivated by the Aztecs, who used tubers as a food source and flowers in ceremonies.
- 🌱 Chantilly Purple and other dahlias have been selectively bred to produce thousands of registered cultivars in nearly every color except true blue, with flower forms ranging from single petals to pompoms.
- 🌱 Dahlia tubers can be divided when dormant to create multiple plants, and a single tuber can produce hundreds of flowers over a season with proper deadheading.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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