How to Grow Dahlia Dinnerplate

Dahlia Dinnerplate

Dahlia pinnata 'Dinnerplate'

flower

Dahlia Dinnerplate is a large-flowered dahlia variety characterized by enormous blooms that can reach 10-14 inches in diameter, resembling dinner plates. These show-stopping flowers come in vibrant colors including red, pink, purple, yellow, and bi-colors, making them prized for cut arrangements and garden display. They are tender perennials typically grown as annuals in cooler climates.

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Café au Lait Decora Dinner Party Karma Choco Tiki Torch Classic Libby

Growing Conditions

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Sun: Full sun, 8+ hours daily for best flowering

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Water: Water deeply and consistently, keeping soil evenly moist but not waterlogged. Water at soil level to avoid wetting foliage. During hot summers, water daily or every other day. Reduce watering in fall.

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Spacing: 24-36 inches

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Days to maturity: 90-120 days from planting to first bloom

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Planting depth: Plant tubers 4-6 inches deep with the 'eye' or growing point facing upward. Plant transplants at soil line.

Soil

Type: Well-draining loamy soil with good organic matter

pH: 6.0-7.0

Amendments:

Compost Aged manure Perlite or sand for drainage Bonemeal for phosphorus

Growing Zones

Find your zone →

Thrives in zones 7-10; grow as annuals in zones 3-6, lifting tubers for winter storage

3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b

Growth Stages

Tuber/Transplant Establishment

2-3 weeks

Tubers or young transplants are planted after frost danger passes. Initial growth is slow as roots establish.

Keep soil consistently moist but not soggy. Hold off on fertilizer for the first 2-3 weeks. Ensure good drainage to prevent tuber rot.

Vegetative Growth

4-6 weeks

Plants develop sturdy stems and multiple sets of leaves. Height increases rapidly, reaching 3-5 feet tall depending on variety.

Provide sturdy stakes or cages early for support of heavy blooms. Pinch off center growing tip when plants reach 12 inches to encourage bushier growth. Begin regular fertilization every 2 weeks with balanced or higher-potassium fertilizer.

Budding

2-3 weeks

Flower buds appear at branch tips. Small rounded buds gradually enlarge and show color hints.

Remove side buds if growing for exhibition-sized blooms (leave only terminal bud). Continue staking as plants become heavier. Maintain consistent watering and fertilization schedule.

Blooming

8-12 weeks (until frost)

Massive dinner-plate flowers open, displaying full color and intricate petal arrangements. Flowers are typically fully open within 3-5 days of bud opening.

Deadhead spent blooms regularly to encourage continued flowering. Water at the base during blooming. Stake heavily as flowers add significant weight. Cut flowers for arrangements in early morning.

Senescence & Tuber Formation

Varies by climate

In zones 7-10, plants begin slowing production in fall. Foliage yellows after frost. In cooler zones, frost kills plants; tubers can be dug and stored.

In warm zones, reduce watering in late fall. In cold zones, dig tubers 1-2 weeks after first frost, dry completely, and store in cool (50-60°F), dry location until spring.

Companion Planting

Plan your garden →

Plant with:

Zinnias Cosmos Salvia Delphiniums Coreopsis Black-eyed Susans Ornamental grasses Cleome

Avoid planting near:

Fennel Root crops that compete for moisture Plants requiring very dry conditions

Common Pests

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Hand-pick, use beer traps, apply copper tape around pots, introduce beneficial nematodes, or use iron phosphate-based baits
Spray foliage with water to dislodge, use insecticidal soap, neem oil, or increase humidity levels
Ensure good air circulation, avoid overhead watering, apply sulfur dust or potassium bicarbonate fungicide at first signs
Spray with water, use insecticidal soap, neem oil, or introduce ladybugs
Set traps with rolled newspaper or diatomaceous earth, or hand-pick in evening
Remove affected flowers, use blue sticky traps, spray with insecticidal soap or neem oil

Uses

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Edible Petals for Garnish

Culinary

Dahlia petals are edible and add vibrant color and mild flavor to salads, desserts, and cocktails. They should only be eaten if grown without pesticides. [source]

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Cut Flowers & Arrangements

Household

Dinnerplate dahlias are exceptional cut flowers, prized by florists and gardeners for their dramatic size, color variety, and longevity in the vase. They work beautifully in large arrangements, wedding bouquets, and statement displays. [source]

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Dried Flower Crafts

Craft

Dahlia blooms can be dried for use in floral crafts, wreaths, and decorative arrangements. Air-dry blooms by hanging upside-down in a warm, dark, well-ventilated space. [source]

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Pollinator Support

Wildlife

Dahlia flowers attract bees, butterflies, and other pollinators, making them valuable for supporting garden ecosystems and promoting biodiversity. [source]

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Garden Display & Exhibition

Household

Dinnerplate dahlias are prized by home gardeners and competitive exhibitors for their spectacular blooms, offering dramatic focal points in garden design and winning at flower shows. [source]

Harvest Tips

Cut flowers in early morning when stems are fully hydrated, using sharp scissors or pruners. Cut at a 45-degree angle just above a leaf node. Remove lower leaves before arranging. Change vase water every 2-3 days and recut stems every 3-4 days for longest vase life (7-10 days possible). For garden display, deadhead spent blooms regularly to extend flowering season until frost.

Fun Facts

🌱 The dahlia is the national flower of Mexico and has been cultivated there for over 2,000 years, originally used by the Aztecs for food and ceremonies.
🌱 Some dinnerplate dahlia blooms can exceed 14 inches in diameter—larger than actual dinner plates—making them among the largest flowers in home gardens.
🌱 Dahlias have tuberous roots that can be divided and stored over winter in cold climates, allowing gardeners to multiply their plants and preserve favorite varieties year after year.

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