How to Grow Dahlia Mignon
Dahlia Mignon
Dahlia × pinnata 'Mignon'
flowerDahlia Mignon is a compact, dwarf dahlia variety prized for its abundant, fully double flowers and bushy growth habit. Reaching only 12-18 inches tall, it produces prolific blooms in vibrant colors throughout summer and fall, making it ideal for containers, borders, and cut flowers. This tender perennial is typically grown as an annual in temperate climates.
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Example Dahlia Mignon timeline · Pittsburgh, PA (Zone 6b)
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Plant Dahlia Mignon
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 Dahlia Mignon blooms
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8-11; grow as tender annual in colder zones
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Sprouting
2-3 weeksTubers or seedlings emerge with initial leaves appearing above soil. Growth is slow in first 2-3 weeks.
Keep soil warm (65-70°F) and moist. Provide light once shoots emerge. Handle tubers gently to avoid rot.
Vegetative Growth
3-4 weeksPlant develops bushy foliage with multiple stems and a rounded, compact form. Leaves are pinnately lobed and green.
Pinch off growing tips when 6 inches tall to encourage bushiness. Maintain consistent moisture and regular feeding every 2 weeks with balanced fertilizer.
Budding
2-3 weeksFlower buds begin to form at stem tips. Buds are tight and green initially, gradually enlarging.
Continue fertilizing, but switch to lower-nitrogen formula to encourage blooming. Remove any diseased foliage. Ensure adequate sun exposure.
Flowering
6-10 weeksFully double, pompom-like flowers in various colors (red, pink, orange, yellow, white, purple) bloom abundantly. Flowers measure 2-3 inches across.
Deadhead spent blooms regularly to encourage continuous flowering. Support stems with stakes if needed. Keep watering consistent even during blooming.
Late Season & Dormancy
4-6 weeks until frostFlowering slows as temperatures cool in fall. In zones 8-11, foliage may die back with first frost; tubers enter dormancy underground.
In cold zones, dig tubers before hard frost, dry thoroughly, and store in cool (50-60°F), dark place. In warm zones, cut back after frost and mulch heavily.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray leaves with water to dislodge; use neem oil or insecticidal soap if severe. Increase humidity around plants.
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Ensure good air circulation; avoid overhead watering. Apply sulfur dust or potassium bicarbonate fungicide if needed.
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Spray with strong water stream; use insecticidal soap or neem oil. Encourage beneficial insects like ladybugs.
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Remove by hand, especially at dusk. Use beer traps or copper tape barriers. Apply diatomaceous earth around plant base.
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Hand-pick in early morning; use pheromone traps away from plants. Avoid insecticides that harm pollinators.
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Ensure excellent drainage; avoid overwatering. Use well-draining soil; improve aeration. Remove affected plants to prevent spread.
Uses
Edible Flowers for Garnish
CulinaryDahlia petals are edible with a slightly sweet flavor and can be used to garnish salads, desserts, and cocktails. They add visual appeal and a delicate, floral note to culinary presentations. [source]
Cut Flowers & Floral Arrangements
CraftDahlia Mignon's compact size and prolific blooms make it excellent for fresh flower arrangements, bouquets, and floral design. Long vase life (7-10 days) and abundant flowers throughout the season provide consistent material for cutting. [source]
Container & Landscape Beauty
HouseholdThe dwarf, bushy habit makes it perfect for containers, window boxes, borders, and small garden spaces. Massed plantings create dramatic color displays. [source]
Pollinator Attraction
WildlifeDahlia flowers attract bees, butterflies, and other pollinators throughout the growing season. Providing a valuable nectar source for beneficial insects supporting garden biodiversity. [source]
Traditional Herbal Use
MedicinalIn some traditional medicine systems, dahlia tubers have been used to support digestive health and as an inulin source. Modern research is exploring potential prebiotic applications. [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 hydrated and blooms are fully open but still firm. Cut at a 45-degree angle with sharp, clean pruners. Strip lower leaves and immediately place stems in cool water. Change water every 2-3 days. Deadheading spent flowers (pinching off just below flower head) prolongs blooming season by 4-6 weeks.
Fun Facts
- 🌱 Dahlia Mignon is a result of decades of breeding to create a compact version of larger dahlia varieties, with the first 'Mignon' cultivars introduced in the 1990s.
- 🌱 The genus Dahlia is named after the 18th-century Swedish botanist Anders Dahl and is Mexico's national flower, with tubers having been cultivated by the Aztecs for food and ceremonial purposes.
- 🌱 Dahlias are classified by flower form into multiple categories (decorative, pompom, ball, waterlily, etc.), with Mignon typically being a pompom or ball type, characterized by their fully double, rounded blooms.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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