How to grow wax plant
Overview
Wax plant (Hoya carnosa) is a climbing or trailing succulent vine grown for its waxy, fragrant flowers and glossy foliage. It thrives in bright, sheltered spots with free-draining soil and should not be overwatered.
Varieties
- Hoya carnosa 'Krimson Queen' — Variegated leaves with creamy edges; popular in AU/NZ for its colourful foliage.
- Hoya carnosa 'Compacta' — Curled, twisted leaves; a compact variety that trails well in hanging baskets.
Soil Preparation
Use a very free-draining mix: orchid bark, perlite, and coarse sand. Slightly acidic to neutral pH (5.5–7.0). Avoid heavy garden soil or water-retentive potting mixes.
Growing Guide
Plant in a pot or hanging basket with a free-draining mix of orchid bark, perlite, and coarse sand. Position in bright, indirect light with protection from harsh afternoon sun. Allow the soil to dry out between waterings; water sparingly in winter. Train onto a trellis or let it trail. Avoid cold drafts and frost.
Care
Feed monthly in spring and summer with a balanced liquid fertiliser diluted to half strength. Prune after flowering to shape and remove spent stems. Repot every 2–3 years in fresh, free-draining mix.
Companion Planting
Good hanging or trellis plant; pair with other epiphytic plants like ferns, orchids, or peperomia. Avoid planting near moisture-loving plants that would keep the soil wet.
Common Pests & Risks
Mealybugs are the main pest; treat with neem oil or a cotton swab dipped in alcohol. Root rot from overwatering is common; ensure free-draining mix and allow soil to dry between waterings.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce watering and check roots. Brown leaf edges: low humidity or sunburn; increase humidity and move to brighter but indirect light. No flowers: insufficient light or too much nitrogen; move to brighter spot and use a bloom-boosting fertiliser. Mealybugs: white cottony clusters on stems; treat with neem oil or alcohol swab. Root rot: mushy, dark roots; repot in fresh mix and water less.