How to grow ixora
Overview
Ixora is a dense, evergreen shrub grown for its vibrant, long-lasting flower clusters and glossy foliage. It provides structure and texture in tropical-style gardens, linking bolder feature plants together. This plant requires consistently warm conditions and acidic soil to thrive.
Varieties
- Ixora coccinea 'Super King' — Large, bright red flower clusters; a vigorous grower for subtropical hedges.
- Ixora 'Dwarf Pink' — Compact, pink-flowered form reaching 60 cm; ideal for pots or low borders.
Soil Preparation
Ixora demands acidic soil with a pH of 5.5–6.5. Before planting, test the soil and amend with powdered sulfur or iron chelate if needed. Ensure the soil is well-draining but moisture-retentive; add composted pine bark or peat moss to improve structure in sandy or clay soils.
Growing Guide
Plant Ixora in a position with morning sun and afternoon shade, such as an east-facing bed. Space shrubs 60–80 cm apart for a dense hedge or 1 m apart as specimens. Dig a hole twice the width of the root ball and backfill with native soil mixed with composted pine bark. Water deeply after planting and maintain even moisture for the first 6–8 weeks until roots establish. Avoid planting in heavy clay or alkaline soil; if needed, raise beds or add sulfur to lower pH.
Care
Feed with a slow-release fertiliser for acid-loving plants (e.g., azalea/camellia food) in early spring and again in late summer. Prune lightly after each flowering flush to shape the shrub and remove spent flower heads. Keep mulch 5–10 cm away from the stem base to prevent rot and fungal issues.
Companion Planting
Pair Ixora with Gardenia for complementary white blooms and similar acid-soil needs, or with Hibiscus for a bold tropical colour contrast. Avoid planting near heavy feeders like citrus that may compete for nutrients, and keep away from plants that require dry, alkaline conditions such as lavender.
Common Pests & Risks
Scale insects appear as brown bumps on stems and leaf undersides; treat with horticultural oil in early spring. Aphids cluster on new growth and can be hosed off or controlled with insecticidal soap. Sooty mould grows on honeydew from these pests; manage by controlling the insects first and wiping leaves with a damp cloth.
Troubleshooting
Yellow leaves with green veins: iron deficiency from alkaline soil; apply iron chelate. Leaf drop in winter: cold damage; protect with shade cloth or move pot indoors. Stunted growth: poor drainage or root rot; improve soil or reduce watering. Brown leaf edges: salt burn from hard water or over-fertilising; flush soil and reduce feed. Sparse flowering: too much shade; move to brighter spot with morning sun.