How to Grow Calibrachoa Million Bells Kabloom Hot Magenta

Calibrachoa Million Bells Kabloom Hot Magenta

Calibrachoa × hybrida 'Kabloom Hot Magenta'

flower

Kabloom Hot Magenta is a prolific flowering calibrachoa cultivar prized for its vibrant magenta blooms and compact, mounding growth habit. This heat and drought-tolerant annual produces hundreds of small petunia-like flowers throughout the growing season with minimal deadheading required. It's an excellent choice for containers, hanging baskets, and garden borders.

Growing Conditions

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Sun: Full sun, 6-8 hours daily (more sun produces more blooms)

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Water: Water regularly but allow soil to dry slightly between waterings. Drought-tolerant once established but performs best with consistent moisture. Reduce watering in cooler months. Avoid overwatering, which can cause root rot.

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Spacing: 12 inches

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Days to maturity: 35-45 days to flowering

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Planting depth: Surface sow or press lightly into soil; seeds need light to germinate

Soil

Type: Well-draining potting soil or amended garden soil

pH: 6.0-6.8

Amendments:

Perlite or sand for drainage Compost for organic matter Slow-release fertilizer

Growing Zones

Find your zone →

Thrives in zones 3-11; grown as a tender annual in all zones

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

Growth Stages

Germination & Seedling

10-14 days

Tiny seeds emerge with cotyledons, then first true leaves appear. Plants are delicate and require high humidity and consistent moisture.

Keep soil consistently moist but not waterlogged. Provide bright, indirect light. Maintain temperatures around 70-75°F. Avoid covering seeds; they need light to germinate.

Vegetative Growth

2-3 weeks

Young plants develop branching structure and foliage. Stems become stronger and leaf size increases. Root system establishes.

Transplant to larger containers when 2-3 inches tall. Pinch tips early to encourage bushier growth. Begin light fertilizing every 2 weeks. Move seedlings under grow lights if indoors.

Budding & Pre-Flowering

2-3 weeks

Plant becomes fuller and more compact. Flower buds begin forming at stem tips. Overall structure becomes mounding.

Gradually acclimate plants to outdoor conditions if growing indoors (hardening off). Increase light intensity. Continue fertilizing every 2 weeks with balanced or bloom-boosting fertilizer.

Flowering & Blooming

8-12 weeks or until frost

Abundant small magenta flowers cover the plant. Blooms open in waves throughout the day. Plant reaches mature mounding size (8-12 inches tall, 12-18 inches wide).

Deadheading is optional; plant is self-cleaning. Water consistently but allow slight drying between waterings. Fertilize weekly with diluted liquid fertilizer or use slow-release. Ensure full sun for maximum blooms.

Decline & End of Season

Until frost or end of season

Flowering slows as temperatures drop in fall or with shorter day length. Plant may become leggy if not maintained. Frost will kill the plant.

Continue light deadheading to maintain appearance. Reduce fertilizer frequency. Plan replacements for next season. Take cuttings for propagation if desired.

Companion Planting

Plan your garden →

Plant with:

Petunias Verbena Bacopa Dusty Miller Ornamental grasses Dianthus Sweet alyssum Scaevola Iresine

Avoid planting near:

Plants requiring shade Plants preferring consistently wet soil Aggressive spreaders in tight containers

Common Pests

Spray with insecticidal soap or neem oil every 7-10 days. Remove heavily infested leaves. Encourage natural predators like ladybugs. Yellow sticky traps can monitor populations.
Increase humidity by misting foliage. Spray with water to dislodge mites. Use miticide or neem oil if severe. Ensure adequate air circulation.
Spray forcefully with water to dislodge. Apply insecticidal soap or neem oil. Use systemic insecticide for persistent infestations. Introduce beneficial insects.
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Remove by hand in early morning or evening. Use beer traps or copper tape barriers. Apply diatomaceous earth around base. Reduce watering frequency.

Uses

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Container & Hanging Basket Gardens

Household

Kabloom Hot Magenta's mounding habit and prolific flowering make it ideal for decorative containers, hanging baskets, and window boxes. A single plant can fill a 10-12 inch basket with color throughout the season. [source]

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Landscape Color & Garden Borders

Household

Use as edging plant or mass planting in garden beds to create bold magenta displays. The drought tolerance and low-maintenance nature make it perfect for sunny garden borders and cottage-style plantings. [source]

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Pollinator Garden Support

Wildlife

The abundant flowers attract bees, butterflies, and hoverflies that help pollinate vegetables and other plants. Calibrachoa flowers provide nectar throughout the growing season with minimal pesticide use. [source]

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Heat & Drought Tolerance

Household

Excellent for hot, sunny locations and areas with water restrictions. Once established, Kabloom requires less frequent watering than many annuals while maintaining excellent flower production. [source]

Harvest Tips

Not typically harvested but enjoy continuous blooms by removing spent flowers throughout the season (optional, as this variety is self-cleaning). Deadheading encourages more blooms but is not necessary. To propagate, take 2-3 inch stem cuttings in late summer and root in moist potting soil.

Fun Facts

🌱 The Kabloom series was bred specifically for its ability to bloom prolifically without deadheading, making it one of the lowest-maintenance flowering annuals available.
🌱 Calibrachoa flowers open and close daily, with buds often opening in waves, which can make a single plant appear to have different flower densities throughout the day.
🌱 Despite their delicate appearance, calibrachoas are surprisingly tough plants that can tolerate heat stress, poor soil, and even temporary drought better than their larger petunia cousins.

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