Hoya australis
Hoya australis
Hoya australis, also known as the Australian wax plant, is a stunning vining plant native to Australia. Its thick, waxy leaves and fragrant flowers make it a popular choice among houseplant enthusiasts. With proper care, it can thrive indoors and add a touch of beauty to any space.
Everything it needs
9 essentials at a glance
Watering
Hoya australis prefers to dry out between waterings.
Water every 1-2 weeks during the growing season (spring and summer), allowing the top 1-2 inches of soil to dry out completely before rewatering. In fall and winter, reduce watering to every 2-4 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaves to shrivel and drop.
Light
Hoya australis thrives in bright, indirect light but can tolerate some direct sunlight.
Ideally, it should receive around 6-8 hours of light daily. Avoid placing it in low-light conditions as this can hinder growth and flowering.
Soil
This plant prefers a well-draining potting mix, ideally a blend of potting soil, perlite, and orchid bark.
A pH range of 6.0 to 7.0 is ideal. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
Hoya australis enjoys moderate to high humidity levels, ideally between 50-70%.
To increase humidity, consider using a humidifier or placing a tray of water near the plant. Signs of low humidity include browning leaf edges and slow growth.
Temperature
The ideal temperature range for Hoya australis is between 60-80°F (15-27°C).
It is hardy in zones 10-12 and can tolerate brief periods of cooler temperatures, but prolonged exposure to temperatures below 50°F (10°C) can be detrimental.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10 or a fertilizer formulated for houseplants.
Fertilize every 4-6 weeks during the growing season and reduce to once every 2-3 months in fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Hoya australis in late winter or early spring to encourage bushier growth and remove any dead or damaged stems.
Use clean, sharp scissors or pruning shears. Deadheading spent flowers can also promote new blooms.
Repotting
Repot Hoya australis every 2-3 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter than the current one. Signs it needs repotting include roots growing out of the drainage holes and slowed growth. When repotting, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Hoya australis can be propagated through stem cuttings.
Take a cutting with at least 2-3 leaves and a node, and let it dry for a few hours to form a callus. Place the cutting in a well-draining potting mix and keep it moist but not soggy. Roots should develop in 4-6 weeks. The best time to propagate is in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or insufficient light.
How to fix it
Adjust watering frequency and ensure the plant receives adequate light.
Dropping leaves
Why it happens
Under-watering or sudden temperature changes.
How to fix it
Check soil moisture and maintain a stable temperature environment.
Root rot
Why it happens
Excessive moisture in the soil.
How to fix it
Remove the plant from the pot, trim away affected roots, and repot in fresh, dry soil.
Pests (e.g., mealybugs, spider mites)
Why it happens
Low humidity and poor air circulation.
How to fix it
Increase humidity, improve air circulation, and treat with insecticidal soap or neem oil.
Poor flowering
Why it happens
Insufficient light or lack of nutrients.
How to fix it
Ensure the plant receives enough bright light and fertilize during the growing season.
Care through the year
Spring
In spring, begin regular watering and fertilizing as the plant enters its active growth phase. Prune any dead or damaged stems to encourage new growth.
Summer
During summer, ensure your Hoya australis receives plenty of bright, indirect light. Water regularly, allowing the soil to dry out between waterings.
Fall
In fall, gradually reduce watering frequency as the plant's growth slows. Continue to fertilize every 4-6 weeks until late fall.
Winter
In winter, water sparingly and avoid fertilizing. Ensure the plant is kept in a warm environment, away from drafts.
Toxicity & Safety
Hoya australis is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always monitor pets around plants.
Good to know
How often should I water my Hoya australis?
Water your Hoya australis every 1-2 weeks during the growing season, allowing the top 1-2 inches of soil to dry out completely between waterings.
Why are my Hoya australis leaves turning yellow?
Yellow leaves can indicate over-watering or insufficient light. Adjust your watering schedule and ensure the plant receives adequate bright, indirect light.
How do I propagate Hoya australis?
Propagate Hoya australis by taking stem cuttings with at least 2-3 leaves and a node. Let the cuttings dry for a few hours, then plant them in a well-draining mix and keep moist until roots develop.
What is the ideal humidity for Hoya australis?
Hoya australis prefers humidity levels between 50-70%. Increase humidity with a humidifier or by placing a tray of water nearby.
When should I repot my Hoya australis?
Repot your Hoya australis every 2-3 years or when you notice roots growing out of the drainage holes, indicating it is root-bound.
Why is my Hoya australis not flowering?
Poor flowering can result from insufficient light or lack of nutrients. Ensure it receives bright, indirect light and fertilize regularly during the growing season.
Is Hoya australis toxic to pets?
Hoya australis is non-toxic to pets and children, but ingestion of large amounts may cause mild gastrointestinal upset.
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