How to Grow Contessa
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Contessa
Dahlia pinnata 'Contessa'
flowerContessa is a stunning dahlia cultivar known for its large, fully double blooms in shades of red, orange, or purple depending on the variety. These striking flowers are excellent for cut arrangements and garden displays. Dahlias are tender perennials typically grown as annuals in cooler climates.
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Example Contessa timeline · Pittsburgh, PA (Zone 6b)
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Plant Contessa
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 Contessa blooms
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Contessa dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 8-11 for year-round growth; zones 3-7 as summer annuals with tuber storage
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Tuber Sprouting
2-3 weeksTubers begin to develop shoots and roots after being planted. Small sprouts emerge from the growth eye.
Keep soil warm (60-70°F ideal) and consistently moist. Do not overwater or tubers may rot. Plant after last frost date.
Vegetative Growth
4-6 weeksPlant develops foliage and strong stems. Leaves are pinnately compound and dark green. Plant grows 3-4 feet tall.
Provide sturdy staking or support cage early. Pinch the growing tip when plant reaches 12 inches to encourage bushier growth. Fertilize every 2-3 weeks.
Bud Formation
2-3 weeksTerminal buds appear at stem tips. Central bud is surrounded by smaller lateral buds.
Remove side buds if you want larger exhibition blooms, or leave them for mass flowering. Continue staking and fertilizing.
Flowering
8-12 weeks until frostLarge, fully double blooms open, typically 4-6 inches in diameter. Flowers are long-lasting on the plant and excellent for cutting.
Deadhead spent flowers regularly to encourage continuous blooming. Cut flowers in early morning for longest vase life. Keep well-watered.
Dormancy/Tuber Storage
Variable; 4-6 months storageIn cool climates, foliage dies back after first frost. Tubers can be dug and stored for winter.
In zones 3-7, dig tubers after foliage blackens from frost. Clean, dry, and store in cool (50-60°F), dark place over winter. In zones 8+, can leave in ground or dig and store.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap; increase humidity; remove heavily infested foliage
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Ensure good air circulation; spray with fungicide; avoid wetting foliage; remove infected leaves
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Hand-pick in early morning; use pheromone traps away from plants; apply neem oil or spinosad
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Spray with insecticidal soap or neem oil; remove affected flowers; encourage natural predators
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and
Hand-pick at dusk; use copper barriers; set beer traps; apply diatomaceous earth
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Trap in rolled newspaper or straw; remove debris; spray with neem oil if severe
Uses
Edible Flowers
CulinaryDahlia petals are mildly sweet and can be used as garnish in salads, desserts, and cocktails. They add visual appeal and subtle flavor to culinary presentations. [source]
Cut Flower Arrangements
HouseholdContessa dahlias are exceptional cut flowers that last 7-10 days in a vase. They are highly valued by florists and ideal for wedding bouquets, centerpieces, and arrangements. [source]
Flower Drying and Crafts
CraftDouble-petaled dahlias like Contessa can be dried for pressed flower crafts, potpourri, or decorative arrangements. Dried petals retain vibrant color for months. [source]
Pollinator Support
WildlifeDahlia flowers attract bees, butterflies, and other beneficial insects to the garden. While fully double varieties have reduced nectar accessibility compared to singles, they still provide valuable food sources. [source]
Traditional and Ornamental Use
MedicinalIn traditional medicine systems, dahlia roots and tubers have been used to support digestive health. However, Contessa is primarily grown for ornamental and horticultural purposes. [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 or late evening when stems are fully hydrated. Cut stems at a 45-degree angle and immediately place in clean, cool water with flower food. Remove lower leaves below the waterline. Re-cut stems every 2-3 days. Flowers last 7-10 days in a vase. For digging tubers in fall, wait until foliage is killed by frost, then carefully excavate tubers, clean off soil, and let dry before storage.
Fun Facts
- 🌱 Dahlias are native to Mexico and were sacred to the Aztecs, who used tubers as a food source similar to potatoes.
- 🌱 Contessa and other large dahlia varieties can produce blooms larger than a dinner plate, with some exhibition varieties exceeding 12 inches in diameter.
- 🌱 Dahlia tubers must be dug and stored indoors in cold climates because they cannot survive freezing temperatures, unlike true perennial bulbs.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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