How to Grow Dahlia 'Dinner Plate'
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Dahlia 'Dinner Plate'
Dahlia × pinnata 'Dinner Plate'
flowerDinner Plate Dahlias are spectacular flowering perennials producing enormous blooms that can reach 10-14 inches in diameter, resembling dinner plates. These dramatic flowers come in a wide range of colors including red, pink, purple, yellow, and white, often with multiple shades per bloom. They are reliable summer bloomers that provide stunning cut flowers and garden focal points from mid-summer through frost.
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Example Dahlia 'Dinner Plate' timeline · Pittsburgh, PA (Zone 6b)
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Plant Dahlia 'Dinner Plate'
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 'Dinner Plate' blooms
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Dahlia 'Dinner Plate' dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 3-10; grown as annuals in cold climates or tubers lifted and stored over winter
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Sprouting
2-3 weeksTubers develop shoots and roots in cool, moist soil. Small green sprouts emerge from the soil surface.
Keep soil consistently moist but not waterlogged. Ensure good drainage to prevent rot. Provide warmth (60-70°F ideal) to encourage sprouting.
Vegetative Growth
3-4 weeksPlant develops compound leaves and a sturdy stem structure with multiple branches. Foliage is lush green with feathery leaflets.
Install sturdy stakes or cages early to support future heavy blooms. Pinch growing tips when 12 inches tall to encourage bushier growth. Water deeply and consistently. Apply balanced fertilizer every 2-3 weeks.
Budding
2-3 weeksFlower buds form at branch tips. Terminal buds are visible, often surrounded by secondary bud sets.
Switch to lower-nitrogen, higher-phosphorus fertilizer to promote flowering. Remove side buds if giant specimen blooms are desired. Continue consistent watering and support with ties.
Flowering
8-12 weeks until frostLarge, showy blooms unfurl with distinctive petal arrangements. Flowers are massive, ranging 10-14 inches across with full, rounded forms.
Deadhead spent blooms regularly to encourage more flowers. Provide supplemental phosphorus fertilizer. Support heavy blooms with soft ties to prevent stem breakage. Water at soil level to keep foliage dry.
Tuber Development & Dormancy
Several monthsAfter frost kills foliage, tubers underground swell and store nutrients for next season. Plant material blackens and dies back.
In zones 3-7, cut stems to 4 inches after first frost. Dig tubers carefully, label with variety name. Cure in a cool, dry place for 1-2 weeks, then store in peat moss or sand at 40-50°F until spring. In zones 8-10, may leave in ground if well-mulched.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity, spray with water, use insecticidal soap or neem oil; avoid overhead watering to prevent fungal issues
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Water at soil level only, improve air circulation, apply sulfur or fungicide, remove affected leaves
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Hand-pick in early morning, use yellow sticky traps, apply neem oil or insecticidal soap, plant trap crops
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Use blue or yellow sticky traps, spray with neem oil or insecticidal soap, remove damaged flowers
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and
(Gastropoda)
Hand-pick at dusk, use copper barriers, beer traps, or diatomaceous earth; avoid mulch touching stems
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Improve air circulation, remove affected flowers, avoid overhead watering, apply fungicide if severe
Uses
Edible Flowers
CulinaryDahlia petals are edible and add visual appeal to salads, desserts, and garnishes, with a slightly sweet, earthy flavor. The tubers are also edible and have been traditionally used as a food source in Mexico. [source]
Cut Flowers & Arrangements
HouseholdDinner Plate Dahlias are prized by florists and gardeners for stunning floral arrangements, wedding flowers, and dramatic cut flower displays. Their enormous blooms serve as natural focal points in any arrangement. [source]
Pollinator Support
WildlifeDahlias attract bees, butterflies, and other beneficial pollinators to the garden, supporting local ecosystems. Their abundant pollen and nectar-rich flowers provide essential food sources throughout summer and fall. [source]
Dried Flower Arrangements
CraftDahlia blooms can be dried for use in long-lasting floral crafts, wreaths, and decorative arrangements. Hang dry in a cool, dark space to preserve color. [source]
Traditional Medicine
MedicinalDahlia tubers have been used in traditional Mexican and Chinese medicine for their potential anti-inflammatory and immune-supporting properties. Modern research continues to explore their phytochemical compounds. [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 blooms in early morning when stems are fully hydrated. Cut stems at 45-degree angles and immediately place in cool water with flower food. Dahlia blooms are extremely long-lasting in vases (7-14 days). Remove lower leaves that would sit in water. Change water every 2-3 days. For maximum continuous blooms in garden, deadhead spent flowers regularly, removing the entire flower head and stem down to the first set of leaves.
Fun Facts
- 🌱 Dinner Plate Dahlias are named after their massive blooms, which can genuinely reach the size of actual dinner plates (10-14 inches across), making them among the largest flowering plants in most home gardens.
- 🌱 Dahlias have been cultivated for over 2,000 years; the Aztecs used them as food, medicine, and in religious ceremonies before Spanish conquistadors brought them to Europe in the 16th century.
- 🌱 Dinner Plate varieties were developed through selective breeding primarily in the 20th century, with the largest specimens winning prestigious awards at dahlia competitions and flower shows worldwide.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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