How to Grow Couleur Cardinal
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Couleur Cardinal
Dahlia × hybrida 'Couleur Cardinal'
flowerCouleur Cardinal is a stunning dahlia cultivar prized for its deep crimson-red blooms with rich burgundy undertones. This decorative dahlia produces full, multi-petaled flowers that reach 4-6 inches in diameter, making it a showstopper in any garden. It's a popular choice for cut flowers and ornamental garden displays.
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Example Couleur Cardinal timeline · Pittsburgh, PA (Zone 6b)
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Plant Couleur Cardinal
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 Couleur Cardinal blooms
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Couleur Cardinal dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 7-10; treat as annual or lift tubers in cooler zones
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Get my Couleur Cardinal timeline →Growth Stages
Sprouting
2-3 weeksTubers develop sprouts and shoots emerge from soil
Plant after last frost when soil is warm (60°F+). Water gently until shoots appear. Keep soil consistently moist but not waterlogged.
Vegetative Growth
4-6 weeksTall stems with compound green foliage develop; plant may reach 3-4 feet tall
Pinch off center stem when plant reaches 12 inches tall to encourage bushy growth. Install stakes or cages for support. Apply balanced fertilizer every 2-3 weeks.
Budding
2-3 weeksFlower buds appear at stem tips; buds gradually enlarge and show color
Switch to lower-nitrogen, higher-phosphorus fertilizer to promote flowering. Continue deadheading adjacent smaller buds to direct energy to main flowers. Maintain consistent watering.
Flowering
8-12 weeksFull, multi-petaled cardinal-red blooms with burgundy tones open to 4-6 inches diameter
Deadhead spent flowers regularly to encourage continuous blooming. Cut stems in early morning for fresh arrangements. Monitor for pests and diseases. Continue regular watering and feeding.
Senescence & Tuber Development
4-8 weeks until frostFlowering slows; foliage yellows as plant energy moves to tuber storage
Reduce watering as temperatures cool. Stop fertilizing. After first light frost, lift tubers carefully, cure in cool dry place for 1-2 weeks, then store in cool (45-50°F), dry location over winter.
Common Pests
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Hand-pick beetles early morning; use row covers; apply neem oil or pyrethrin insecticide; consider Japanese beetle traps placed away from dahlias
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Spray with strong water stream; apply insecticidal soap; use neem oil; introduce ladybugs or lacewings
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Increase humidity by misting; spray with water; apply miticide or neem oil; encourage predatory mites
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and
(Gastropoda)
Remove by hand at dusk; use copper barriers; apply diatomaceous earth; set beer traps; use iron phosphate bait
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Ensure good air circulation; avoid overhead watering; apply sulfur dust or fungicide; remove affected leaves
Uses
Edible Garnish
CulinaryDahlia petals are edible with a slightly sweet, peppery flavor and add visual drama to salads, desserts, and cocktails. [source]
Cut Flower Arrangements
CraftThe cardinal-red, full-petaled blooms are prized by florists and gardeners for dramatic fresh and dried arrangements, bouquets, and special occasion decorations. [source]
Garden Display & Ornamental
HouseholdCouleur Cardinal creates a stunning focal point in borders, beds, and containers, adding depth of color and texture to garden landscapes. [source]
Pollinator Support
WildlifeThe abundant blooms attract bees, butterflies, and other pollinators, supporting local ecosystems and promoting biodiversity. [source]
Traditional Wellness
MedicinalIn some traditional practices, dahlia flowers and roots have been used in herbal remedies, though scientific evidence is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers in early morning when stems are fully hydrated, using sharp scissors or pruning shears. Cut at a 45-degree angle just above a leaf node. Remove lower leaves below the waterline. Recut stems and change water every 2-3 days. Blooms last 7-10 days in a vase. For tuber harvesting in fall, wait until foliage is blackened by frost, dig carefully to avoid damaging tubers, cure in cool place, then store over winter.
Fun Facts
- 🌱 Dahlias originated in Mexico and were considered sacred by the Aztecs, who used tubers as a food source and flowers in ceremonies.
- 🌱 Couleur Cardinal's name means 'Cardinal Color' in French, referring to the distinctive deep crimson-red hue resembling a cardinal's plumage.
- 🌱 Dahlias are the national flower of Mexico and come in nearly every color except true blue; they can produce hundreds of blooms per plant over a season with proper deadheading.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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