How to Grow Double Petunia

Double Petunia

Petunia × hybrida

flower

Double petunias are ornamental flowering plants featuring full, ruffled blooms with multiple layers of petals, creating a rose-like or carnation-like appearance. These showy flowers come in a wide range of colors and are popular for containers, beds, and hanging baskets. They bloom prolifically throughout warm weather and attract pollinators with their colorful, fragrant flowers.

Looking for a specific variety?

Petunia 'Double Purple' Petunia 'Double White' Petunia 'Double Rose' Petunia 'Double Pink' Petunia 'Double Salmon' Petunia 'Double Burgundy'

Growing Conditions

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Sun: Full sun, 6-8 hours daily (minimum 5 hours; more sun promotes better flowering)

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Water: Keep consistently moist but not waterlogged. Water when top inch of soil is dry. In containers, may need daily watering in hot weather. Reduce watering in fall and winter.

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Spacing: 12 inches

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Days to maturity: 60-90 days from transplant to first blooms

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Planting depth: Surface plant seeds (they need light to germinate); transplants at soil level

Soil

Type: Well-draining loamy soil with organic matter

pH: 6.0-6.8

Amendments:

Compost Peat moss Perlite Aged bark

Growing Zones

Find your zone →

Thrives in zones 3-11 as annuals; can overwinter in zones 9-11

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b

Growth Stages

Seed to Seedling

7-14 days

Tiny seeds germinate on moist soil surface under bright light. First true leaves appear within 7-10 days.

Keep soil consistently moist. Provide bright light (LED grow lights ideal). Maintain temperature of 70-75°F. Do not cover seeds.

Seedling Development

2-3 weeks

Plant develops 2-4 true leaves and begins to establish root system. Growth is relatively slow at this stage.

Thin seedlings if crowded. Maintain bright light and warm temperatures. Begin fertilizing with diluted liquid fertilizer every 2 weeks.

Vegetative Growth

3-4 weeks

Plant forms bushy stems and abundant foliage. Pinching encourages branching and fuller shape.

Pinch off stem tips when plant reaches 4-6 inches to promote bushiness. Transplant to larger containers or garden. Reduce nitrogen fertilizer to prevent excessive leaf growth at expense of flowers.

Flowering

8-12 weeks (extends until frost)

Multiple buds form along stems and open into showy double blooms. Continuous blooming occurs with regular deadheading.

Deadhead spent flowers regularly to encourage more blooms. Water consistently. Fertilize every 2-3 weeks with balanced or slightly higher phosphorus fertilizer. Reduce pinching.

Late Season Decline

Variable

Flowering may slow or stop in very hot summers or as temperatures cool in fall. Plant may become leggy.

Cut back leggy growth by 1/3 to 1/2 to encourage new flowering. Provide afternoon shade in intense heat. In zones 9-11, bring indoors before frost or treat as annual.

Companion Planting

Plan your garden →

Plant with:

Marigold Salvia Calibrachoa Sweet potato vine Dusty miller Vinca Begonia Verbena

Avoid planting near:

Fennel Dill Heavily competing vigorous vines

Common Pests

Spray with water to dislodge; apply insecticidal soap or neem oil; encourage natural predators like ladybugs
Increase humidity; spray foliage with water; apply miticide or neem oil if severe
Use yellow sticky traps; spray with insecticidal soap; apply neem oil weekly
Remove affected flowers and leaves; improve air circulation; avoid overhead watering; apply fungicide if needed
Remove infected plants; control thrips; no cure—prevention through resistant varieties is best

Uses

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Container and landscape decoration

Household

Double petunias are prized ornamental flowers for decorating patios, balconies, garden beds, and hanging baskets. Their full, rose-like blooms add visual interest and color to any outdoor or indoor display. [source]

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Pollinator attraction

Wildlife

Petunia flowers attract butterflies, bees, and hummingbirds to gardens, supporting local pollinator populations. The colorful blooms and accessible nectar make them valuable for wildlife gardens. [source]

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Cut flowers and floral arrangements

Craft

Double petunia blooms make attractive cut flowers for fresh arrangements and can be dried for long-lasting craft projects. Their ruffled texture adds texture and dimension to bouquets. [source]

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Fragrance

Household

Many double petunia varieties emit a pleasant, sweet fragrance, especially in evening hours. The perfumed flowers add sensory appeal to gardens and patios. [source]

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Traditional herbal use

Medicinal

In traditional herbalism, petunia flowers and leaves have been used in some cultures to make infusions and teas believed to have mild calming properties, 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

Deadhead (remove) spent double flowers regularly to encourage continuous blooming throughout the season. Pinch off flower heads cleanly just below the bloom. For dried flowers, cut stems when blooms are fully open and hang upside down in cool, dry location. Double petunias are primarily ornamental and not typically harvested for consumption.

Fun Facts

🌱 Double petunias cannot reproduce from seeds because their doubled flowers lack reproductive organs—all double varieties must be propagated from cuttings, making them true hybrids dependent on human cultivation.
🌱 Petunias are related to tomatoes and peppers, all belonging to the Solanaceae (nightshade) family, and share similar growing preferences including preference for warm temperatures and full sun.
🌱 The name 'petunia' comes from the Guarani Tupi word 'petun,' which means 'tobacco'—a reflection of the plant's botanical relationship to tobacco plants.

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