How to Grow Calibrachoa Superbells

Calibrachoa Superbells

Calibrachoa × hybrida 'Superbells'

flower

Superbells are a hybrid calibrachoa (million bells) variety known for producing abundant small, trumpet-shaped flowers in a wide range of vibrant colors throughout the growing season. These compact, trailing plants are ideal for hanging baskets, containers, and ground cover, thriving in warm weather and offering extended blooms with minimal deadheading. They are more heat and weather tolerant than their petunia relatives, making them excellent performers in challenging growing conditions.

Looking for a specific variety?

Superbells Blue Superbells Scarlet Superbells Cherry Red Superbells Trailing Yellow Superbells Whitegold Superbells Deep Purple Morn

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial afternoon shade in extreme heat but blooms best in full sun

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Water: Keep soil consistently moist but not waterlogged; water when top inch of soil is dry. Container plants may need daily watering in hot weather. Superbells are more drought-tolerant than petunias once established.

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Spacing: 12-18 inches apart for landscape planting; one plant per 10-12 inch hanging basket inches

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Days to maturity: 30-45 days to reach full flowering size from transplant

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Planting depth: Surface planting; seeds need light to germinate, so press gently into soil without covering. Transplants should be set at same depth as their container.

Soil

Type: Well-draining potting soil or light, sandy loam

pH: 6.0-6.5

Amendments:

Compost peat moss perlite coconut coir

Growing Zones

Find your zone →

Best in zones 5-10 as a warm-season annual; can be grown in zones 3-4 but plant after last frost

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

Growth Stages

Seedling

2-3 weeks

Tiny seedlings emerge with two small cotyledons, developing first true leaves within 1-2 weeks. Very delicate and requires high humidity and consistent moisture.

Maintain soil moisture without waterlogging. Provide bright light but avoid direct scorching sun. Ensure excellent air circulation to prevent damping-off. Keep at 70-75°F.

Vegetative Growth

3-4 weeks

Plant develops bushy, compact growth with multiple stems and increasingly divided foliage. Leaves are small, narrow, and slightly sticky to touch.

Begin gentle fertilizing at half strength weekly. Pinch growing tips once or twice to encourage branching. Ensure full sun and good air circulation. Harden off gradually before transplanting outdoors.

Early Flowering

2-3 weeks

First small flower buds appear at branch tips; flowers begin opening in small clusters. Plant continues to grow and branch simultaneously.

Switch to regular fertilizer schedule, or use bloom-promoting fertilizer. Maintain consistent watering and full sun exposure. Light deadheading encourages more blooms but is not essential.

Peak Flowering

8-12 weeks (or until frost in cool climates)

Plant is covered with abundant small trumpet-shaped flowers in solid colors or with contrasting throats and veining. Growth slows as energy focuses on flower production.

Continue regular watering and weekly feeding with balanced or bloom-promoting fertilizer. Deadheading is optional; plant self-cleans well. Watch for pests and stress from extreme heat or drought.

End of Season / Senescence

4+ weeks (frost dependent)

As temperatures cool or frost threatens, flowering slows and foliage may yellow or darken. In warm climates, plant may continue blooming year-round.

In zones 3-9, expect frost to kill plant; remove and compost. In zones 10+, prune back heavily in late winter to rejuvenate for next season. Reduce watering and feeding as growth slows.

Companion Planting

Plan your garden →

Plant with:

Dusty miller Bacopa Verbena Salvia Angelonia Scaevola Sweet alyssum Ornamental grasses Dahlias

Avoid planting near:

Plants requiring consistently wet soil Heavy feeders that compete for nutrients

Common Pests

Spray with insecticidal soap or neem oil, focusing on leaf undersides. Increase air circulation. Yellow sticky traps help monitor populations.
Mist foliage regularly to increase humidity. Use miticide or spray with strong water jet. Neem oil is effective preventatively.
Spray with strong water stream or insecticidal soap. Encourage natural predators. Neem oil or horticultural oil sprays are effective.
Improve air circulation and reduce leaf wetness. Remove affected flowers promptly. Avoid overhead watering. Fungicide sprays if severe.

Uses

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Not for culinary use

Culinary

Calibrachoa flowers are ornamental only and not intended for consumption. [source]

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Fresh cut flower arrangements

Craft

Small delicate stems with flowers can be used in miniature floral arrangements, fairy gardens, or as garnish for special events. [source]

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Container and basket gardening

Household

Superbells are exceptional in hanging baskets, window boxes, containers, and mixed planters, providing cascading color for months. [source]

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Pollinator attraction

Wildlife

The abundant small flowers attract bees, hoverflies, and other beneficial pollinators throughout the season, supporting garden ecosystems. [source]

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Summer landscape color

Household

Used as annual bedding to provide season-long floral displays in borders, rock gardens, and mixed plantings with exceptional heat and weather tolerance. [source]

Harvest Tips

Calibrachoa is ornamental and not harvested for food. Deadheading (removing spent flowers) is optional but encourages continuous blooming; simply pinch off faded flowers. The plant naturally self-cleans flowers and reblooms prolifically without deadheading. Harvesting stems for flower arrangements is possible but will temporarily reduce bloom display.

Fun Facts

🌱 Calibrachoa was first discovered in South America (Argentina and Brazil) and was unknown to cultivation until the 1990s; Superbells was introduced in 2001 and revolutionized the annual flower market.
🌱 Despite their petunia-like appearance, calibrachoas are in the same genus but are distinct species; they produce far fewer seeds and fewer flowers per plant than petunias, making them a superior ornamental.
🌱 Superbells varieties include over 20 color options ranging from solid hues to bicolors with contrasting throats and veining, and individual flowers are significantly smaller (about 1 inch) than petunia blooms but produced in such abundance the effect is spectacular.

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