How to Grow Million Bells Superbells

Million Bells Superbells

Calibrachoa × hybrida 'Superbells'

flower

Superbells is a premium hybrid calibrachoa series known for producing masses of small, petunia-like flowers in vibrant colors. These compact, mounding plants bloom prolifically from spring through fall with minimal deadheading required. They are excellent for containers, hanging baskets, and garden beds, thriving in warm weather and full sun.

Looking for a specific variety?

Superbells Pomegranate Punch Superbells Cherry Red Superbells Blueberry Punch Superbells Watermelon Pink Superbells Yellow Superbells Trailing White

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum; 8+ hours optimal for continuous blooming

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Water: Keep soil consistently moist but not waterlogged. In containers, water when top inch of soil is dry. In hanging baskets, may need daily watering in hot weather. Reduce watering slightly in cool weather.

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Spacing: 6-12 inches apart (depending on mature size; typically 10-15 inches wide) inches

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Days to maturity: 30-45 days from transplant to first flowers; continuous bloom thereafter

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Planting depth: Plant transplants at soil level; do not bury stem. Seeds are tiny and should be surface-sown under lights with high humidity.

Soil

Type: Light, well-draining potting soil or garden soil with perlite

pH: 6.0-7.0

Amendments:

Perlite or coarse sand for drainage Compost or aged bark for moisture retention Controlled-release fertilizer mixed into soil

Growing Zones

Find your zone →

Grows as an annual in zones 2-9; tender perennial in zones 10-11. Thrives best in zones 5-9 where warm season is longest.

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

Growth Stages

Seedling

3-4 weeks

Tiny seedlings emerge with cotyledons; very delicate and slow-growing initially. Requires high humidity and consistent moisture.

Keep under grow lights at 16-18 hours daily. Maintain 70-75°F. Provide excellent drainage to prevent damping off. Thin seedlings early.

Vegetative/Transplant

4-6 weeks

Develops true leaves and branching structure. Plant becomes bushier and ready for transplanting or larger containers.

Harden off gradually before outdoor planting. Keep moist but well-draining. Begin fertilizing weekly with balanced or slightly high-nitrogen formula. Pinch tips if leggy to encourage branching.

Pre-Bloom

2-3 weeks

Plant reaches mature size with abundant foliage. Buds begin forming on branch tips.

Ensure full sun exposure. Switch to higher-phosphorus fertilizer to encourage blooming. Maintain consistent watering. Begin weekly fertilizing with bloom-promoting formula.

Flowering/Bloom

12+ weeks (mid-June through October frost)

Hundreds of small, trumpet-shaped flowers cover the plant. Blooms continuously from early summer through first frost.

Continue weekly or bi-weekly fertilizing. Deadheading is minimal as plant sheds spent flowers naturally. Water regularly, especially in containers. Pinch back leggy growth mid-summer to refresh plant.

Late Season/Decline

Until first frost

Flowering may slow in late fall as temperatures drop. Plant remains attractive but produces fewer blooms.

Reduce fertilizing. Plant will decline with first hard frost (28°F/-2°C). Can be dug up and overwintered indoors in zones 9-11, or grown as annual.

Companion Planting

Plan your garden →

Plant with:

Dusty Miller Ornamental Grasses Bacopa Lobelia Variegated Ivy Heuchera Salvia Pentas Begonias Bidens

Avoid planting near:

Plants preferring shade (hostas, ferns, impatiens) Water-loving plants requiring constant moisture (sedges, moisture-loving hostas) Tall plants that shade Superbells

Common Pests

Spray with insecticidal soap or neem oil; encourage beneficial insects; increase air circulation
Mist foliage regularly; spray with water; use miticide if severe
Strong water spray to dislodge; insecticidal soap; neem oil; attract ladybugs
Allow soil surface to dry between waterings; use yellow sticky traps; apply sand layer on top of soil
Improve air circulation; reduce overhead watering; remove affected foliage; fungicide if necessary

Uses

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Edible Flowers

Culinary

Superbells flowers are technically edible and can garnish salads or desserts, though they are primarily grown for ornamental value rather than flavor. Check that no pesticides have been applied before using. [source]

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Container & Basket Gardening

Household

Superbells excel in hanging baskets, window boxes, and mixed containers. Their mounding, cascading habit and prolific blooming make them ideal for creating dramatic floral displays with minimal maintenance. [source]

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Floral Arrangements

Craft

The delicate flowers and trailing stems are suitable for fresh cut flower arrangements and design work, bringing color and texture to bouquets. [source]

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Pollinator Attraction

Wildlife

The abundant small flowers attract bees, butterflies, and hummingbirds throughout the growing season, making Superbells an excellent choice for supporting pollinator populations. [source]

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Landscape Color

Household

Available in a wide range of vibrant colors (pink, purple, red, white, yellow, orange), Superbells provide sustained garden color from spring through frost without major deadheading or maintenance. [source]

Harvest Tips

Superbells does not produce a traditional harvest. For ornamental purposes, pinch back or deadhead spent flowers to maintain shape and encourage reblooming, though the plant naturally sheds old flowers. Cut stems for fresh arrangements as desired.

Fun Facts

🌱 Superbells is a trademarked series developed by Proven Winners and is the result of hybrid calibrachoa breeding; new colors are continually developed and released.
🌱 A single mature Superbells plant can produce hundreds of flowers over a season, giving rise to the 'million bells' common name for the calibrachoa genus.
🌱 Superbells are more heat and humidity tolerant than many petunia varieties, making them superior performers in warm, wet climates where petunias struggle with fungal issues.

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