Best Fertiliser for Bird of Paradise in Australia

The Bird of Paradise (Strelitzia reginae and Strelitzia nicolai) is famous for its vibrant, crane-like flowers and bold foliage. To achieve strong growth and reliable blooms, the right fertiliser is essential. This guide explains which nutrients Bird of Paradise needs, when to fertilise, and the best fertiliser options for Australian gardens and indoor plants.

Nutritional Needs of Bird of Paradise

Bird of Paradise plants are heavy feeders compared to many ornamentals. They require a steady supply of nutrients to produce both lush leaves and flowers:

Nitrogen: Keeps foliage strong and deep green.
Phosphorus: Promotes flower production and strong root growth.
Potassium: Strengthens stems and supports long-lasting blooms.
Calcium & Magnesium: Essential trace elements that prevent leaf yellowing and weak growth.

Seasonal Timing in Australia:

Spring & Summer: Fertilise every 4–6 weeks to drive flowering and foliage growth.
Autumn: Continue light feeding to strengthen the plant before cooler weather.
Winter: Pause or reduce feeding in temperate zones; subtropical climates can maintain lighter fertilising.

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How to Fertilise Bird of Paradise

Application depends on whether the plant is grown in the ground or in pots:

Outdoor plants: Apply a liquid fertiliser evenly around the drip line. Water in well to help nutrients penetrate the soil.
Potted plants: Use a diluted liquid fertiliser to avoid root burn. Feed regularly during the growing season.
Established clumps: Supplement with slow-release fertiliser every 3–4 months for sustained feeding.

Recommended Fertilisers:

CompleteGrow NPK 20-20-20 Liquid Fertiliser — ideal for outdoor Bird of Paradise, balancing foliage and flower production.
CompleteGrow Advanced Formula NPK 4-18-38 + CaMg — excellent for boosting flowers and supporting strong roots.

Application tip: Always fertilise after watering to avoid fertiliser burn, particularly in pots.

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Aftercare & Fertilising FAQs

Fertilising works best when combined with good cultural care. Bird of Paradise thrives in full sun, free-draining soil, and regular deep watering. FAQs Q1: What is the best fertiliser for Bird of Paradise to encourage flowers? A: Use a high-phosphorus blend such as CompleteGrow 4-18-38 + CaMg during spring and summer. Q2: How often should I fertilise Bird of Paradise in pots? A: Every 4–6 weeks in spring and summer with a diluted liquid fertiliser. Q3: Can I use lawn fertiliser on Bird of Paradise? A: No — lawn fertilisers are too high in nitrogen and will reduce flowering. Q4: Why is my Bird of Paradise not flowering even with fertiliser? A: The plant may not be mature enough, or it may be lacking sunlight. Ensure it receives at least 6 hours of sun daily. Q5: Do I need to fertilise in winter? A: In most temperate Australian regions, pause feeding in winter. Subtropical growers can continue light feeding.