How to grow ivy geranium
Overview
Ivy geranium (Pelargonium peltatum) is a trailing, semi-succulent herb grown for its glossy, ivy-shaped leaves and cascading clusters of single or double flowers. It thrives in hanging baskets and window boxes, and requires a warm, frost-free position with excellent drainage to avoid root rot.
Varieties
- Pelargonium peltatum 'Cascade' — A vigorous trailing series with large flower heads, ideal for hanging baskets in Australian heat.
- Pelargonium peltatum 'Summer Showers' — A classic mix of pastel colours bred for long flowering in temperate and subtropical gardens.
- Pelargonium peltatum 'Ville de Paris' — An old-fashioned red variety with strong trailing habit, popular in NZ and southern Australia.
Soil Preparation
Prefers a slightly acidic to neutral pH (6.0–7.0) in a free-draining, sandy or loamy mix. For pots, use a soilless potting medium with added perlite. Avoid heavy clay or water-retaining soils; amend beds with coarse grit or composted bark before planting.
Growing Guide
Plant ivy geranium in full sun with at least 6 hours of direct light. Use a premium potting mix with added perlite or coarse sand for sharp drainage; space plants 30–40 cm apart in beds or 1 per 30 cm basket. Set the crown slightly above soil level to prevent stem rot. Pinch tips at planting to encourage branching, and avoid overhead watering in humid weather.
Care
Feed monthly from spring to autumn with a balanced liquid fertiliser (e.g., 10-10-10) diluted to half strength. Prune back leggy stems in late summer to maintain a compact shape. Deadhead regularly by snapping off spent flower stalks to prolong blooming and prevent seed set.
Companion Planting
Pair with trailing lobelia, blue alyssum, and petunias for a classic colour contrast. Avoid planting near heavy feeders like tomatoes or under trees that cast dense shade, as ivy geranium needs consistent sun and dry feet.
Common Pests & Risks
Caterpillars (especially geranium plume moth) chew leaves and buds; hand-pick or spray with Bacillus thuringiensis. Whitefly and rust (Puccinia pelargonii) are common in humid spells—improve air circulation and remove infected leaves. Aphids cluster on new growth; blast off with water or use horticultural soap.
Troubleshooting
Yellow leaves: overwatering or poor drainage—let soil dry out between waterings. Brown leaf edges: salt burn from fertiliser or hard water—flush pot with rainwater. Leggy growth: insufficient light—move to full sun. Rust spots: fungal infection—remove affected leaves and improve air circulation. Bud drop: sudden temperature change or underwatering—stabilise conditions.