How to grow million bells
Overview
Million bells (Calibrachoa pygmaea) is a tender perennial from the Solanaceae family, grown as an annual in most Australian gardens. It is prized for its prolific, small petunia-like flowers that bloom from spring through autumn. This plant is ideal for filling pots, hanging baskets, and garden borders with continuous colour.
Varieties
- Calibrachoa 'Million Bells' — The classic series with a wide range of colours, very free-flowering and compact.
- Calibrachoa 'Superbells' — Larger flowers than the standard series, excellent for hanging baskets in Australian conditions.
- Calibrachoa 'Cabaret' — A trailing variety with pastel shades, ideal for mixed containers.
Soil Preparation
Million bells prefers slightly acidic soil (pH 5.5–6.5) with excellent drainage. In garden beds, amend heavy clay with compost and sand; in pots, use a quality soilless mix. Add a slow-release fertiliser at planting for steady nutrition.
Growing Guide
Plant million bells in full sun with well-drained soil; in pots use a premium potting mix. Space plants 20–30 cm apart for a dense groundcover or 15 cm apart in containers. Water regularly to keep the soil evenly moist but never waterlogged, especially in hot weather. In cooler zones, wait until after the last frost to plant out, as it is frost-tender. Pinch back young tips to encourage branching and a fuller habit.
Care
Feed every 2–4 weeks with a balanced liquid fertiliser (e.g., 10-10-10) during the growing season. Deadhead spent flowers regularly to extend blooming; in late summer, trim back leggy stems by one-third to rejuvenate. Avoid over-fertilising with high nitrogen, which promotes leaf growth over flowers.
Companion Planting
Million bells pairs beautifully with alyssum, petunias, and lobelia for a colourful, trailing display. Avoid planting near aggressive root competitors like large grasses or trees that may steal moisture. Good companions also include verbena, diascia, and bacopa for similar sun and water needs.
Common Pests & Risks
Aphids and spider mites can attack million bells, especially in dry or hot weather. Control aphids with a strong water spray or insecticidal soap; for mites, increase humidity around the plant. Whitefly may also appear; use yellow sticky traps or neem oil.
Troubleshooting
Yellow leaves: overwatering or poor drainage; let soil dry slightly between waterings. Brown leaf edges: underwatering or hot, dry winds; increase watering and mulch. Leggy growth: insufficient light; move to full sun or pinch back. Few flowers: too much shade or high nitrogen fertiliser; switch to a bloom-booster feed. Root rot: waterlogged soil; improve drainage or repot.