How to grow ornamental ginger
Overview
Ornamental ginger (Alpinia purpurata) is a lush, herbaceous perennial grown for its striking red or pink bracts that resemble flowers. It is prized for adding tropical colour and texture to garden beds, and thrives in warm, humid conditions with consistent moisture.
Varieties
- Alpinia purpurata 'Red Ginger' — The classic form with vivid red bracts, widely grown in tropical and subtropical Australian gardens.
- Alpinia purpurata 'Pink Ginger' — A pink-bracted variety that adds a softer colour to the garden, popular in coastal Queensland.
Soil Preparation
Ornamental ginger prefers rich, loamy soil with a pH of 6.0–7.0. Improve drainage by adding organic matter like compost or well-rotted manure before planting. Avoid heavy clay or sandy soils; if needed, amend with coco coir or peat moss to boost moisture retention.
Growing Guide
Plant ornamental ginger in a sheltered spot with bright, filtered light or morning sun and afternoon shade. Space rhizomes 30–50 cm apart and 5–10 cm deep in rich, well-draining soil. Keep soil consistently moist during active growth; reduce watering slightly in cooler months. Apply a thick layer of organic mulch to retain moisture and suppress weeds. In subtropical zones, protect from strong winds and occasional light frosts with a frost cloth.
Care
Feed monthly from spring to early autumn with a balanced liquid fertiliser (e.g., 10-10-10) or slow-release pellets. Cut spent flower stems back to the base after blooming to encourage new growth. Remove yellowing or dead leaves regularly to keep the clump clean and reduce disease risk.
Companion Planting
Pair ornamental ginger with heliconias, costus, and other tropical gingers for a cohesive lush look. It also grows well with bird of paradise (Strelitzia) and philodendrons. Avoid planting near drought-tolerant plants like succulents or lavender, which require opposite watering regimes.
Common Pests & Risks
Scale insects and leaf rollers are common on ornamental ginger. Treat scale with horticultural oil or soap spray, and remove leaf rollers by hand or use a targeted Bacillus thuringiensis (Bt) spray. Keep the clump tidy by removing dead leaves to reduce pest habitat.
Troubleshooting
Yellowing leaves: often from overwatering or poor drainage; check soil and reduce water if soggy. Brown leaf edges: caused by low humidity or dry air; increase misting or move to a more humid spot. Stunted growth: usually from insufficient light or cold; relocate to brighter, warmer position. Leaf drop: may indicate frost damage; protect with mulch or frost cloth in cooler zones. Pest infestation: scale or leaf rollers; treat with neem oil or soap spray promptly.