How to Grow Calibrachoa Superbells Blue

Calibrachoa Superbells Blue

Calibrachoa × hybrida 'Superbells Blue'

flower

Superbells Blue is a compact, mounding petunia relative with vibrant blue flowers and exceptional heat and disease tolerance. This hybrid calibrachoa produces abundant small trumpet-shaped blooms throughout the growing season with minimal deadheading required. It's ideal for containers, hanging baskets, and garden beds where continuous color is desired.

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum; 8+ hours preferred for best blooming

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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. Reduce watering slightly in cool seasons.

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Spacing: 12-18 inches apart; 1 per 10-inch container inches

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Days to maturity: 30-45 days to first blooms

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Planting depth: Transplant seedlings at same depth as cell; do not bury stem

Soil

Type: Well-draining potting soil or light loamy soil with organic matter

pH: 6.0-6.5

Amendments:

Compost Peat moss or coco coir Perlite for drainage

Growing Zones

Find your zone →

Thrives as annual in zones 3-11; perennial in zones 10-11

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

Growth Stages

Seedling

2-3 weeks

Tiny plants with 2-4 true leaves, delicate and requiring protection from direct harsh sun initially

Keep soil evenly moist; provide bright indirect light; avoid overwatering to prevent damping-off; maintain 65-75°F temperature

Vegetative Growth

2-3 weeks

Plant develops branching stems and dense foliage; leaves are small and glossy; no flowers yet

Gradually acclimate to full sun; pinch back growing tips if leggy to encourage bushiness; maintain consistent moisture; begin fertilizing with diluted balanced fertilizer

Flowering Initiation

1 week

Small blue trumpet-shaped flower buds appear at branch tips; plant has filled out with multiple stems

Maintain full sun exposure; switch to higher phosphorus fertilizer (lower nitrogen) to promote blooms; keep soil consistently moist; ensure good air circulation

Peak Flowering

4-6 months (until frost or end of season)

Abundant small blue flowers cover the plant; flowers persist even in heat; mounding or trailing habit becomes apparent depending on placement

Deadheading is optional as plant self-cleans well; fertilize every 1-2 weeks; water consistently; monitor for spider mites and whiteflies in hot weather; do not overwater

Late Season/Decline

Until frost or end of growing season

In cooler climates, flowering continues but slows as day length decreases and temperatures drop; plant may become less vigorous

Reduce fertilizer frequency; discontinue if hard frost is imminent; in frost-free zones, can be overwintered indoors or in protected location for next year

Companion Planting

Plan your garden →

Plant with:

Dusty Miller Bacopa Trailing Petunias Ivy Salvias Begonias Dahlia Senecio (String of Pearls)

Avoid planting near:

Very tall plants that shade containers Plants requiring very dry conditions

Common Pests

Spray with water to dislodge; use miticide if severe; increase humidity; ensure good air circulation
Use yellow sticky traps; spray with insecticidal soap; apply neem oil in evening; encourage beneficial insects
Spray with strong water stream; use insecticidal soap or neem oil; introduce ladybugs
Allow soil to dry slightly between waterings; use yellow sticky traps; apply beneficial nematodes to soil
and
Remove by hand in early morning; apply copper tape to container rims; use slug baits if needed

Uses

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Not for consumption

Culinary

Calibrachoa flowers are not edible and should not be consumed by humans or pets. [source]

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Container and hanging basket gardening

Household

Superbells Blue excels in containers, hanging baskets, window boxes, and mixed planters, providing reliable summer-long color with minimal maintenance. Its compact mounding habit makes it ideal for small spaces and patio gardens. [source]

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Heat and drought tolerance for outdoor displays

Household

This variety is exceptionally heat-tolerant and disease-resistant, performing better than many petunias in hot, humid climates. It recovers quickly from weather stress and continues blooming through summer heat waves. [source]

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Pollinator garden attraction

Wildlife

Small blue flowers attract bees, butterflies, and hummingbirds, adding pollinator support to gardens and patios while providing continuous nectar sources. [source]

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Cut flower arrangements

Craft

Small sprays of blue blooms can be used in mixed miniature arrangements, though they have a short vase life; better enjoyed as living displays. [source]

Harvest Tips

Not harvested; deadheading is optional as Superbells Blue self-cleans and drops spent flowers naturally. Remove spent flower stems only if desired for aesthetics. Plant will bloom continuously from first flowers until frost with proper care.

Fun Facts

🌱 Superbells Blue is part of the Superbells series, bred specifically for superior garden performance with exceptional heat and disease resistance compared to regular petunias.
🌱 Calibrachoa flowers are significantly smaller than petunias, with delicate trumpet blooms that remain open in warm weather, unlike some petunias that close in extreme heat.
🌱 The blue color in Calibrachoa comes from anthocyanin pigments, the same compounds found in blueberries that have antioxidant properties in plants.

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