Smooth-barked kauri (Agathis robusta)

Agathis robusta, commonly known as the Queensland Kauri, thrives on a watering principle that maintains consistency but avoids waterlogging. When watering, ensure the soil is moist but not soggy, allowing the first few inches of soil to dry out before the next watering. Aim for a deep soak that reaches the roots, approximately 500ml per session.

The ideal light for Agathis robusta is partial to full sun, with benefits including improved growth, vibrant foliage, and improved resilience. The plant flourishes under balanced light conditions that mimic its natural tropical environment. More About Sunlight Requirements Techniques→

Agathis robusta thrives best in temperatures ranging from 65°F to 77°F. Maintaining this range ensures optimal growth and health, as the plant is adapted to thrive in moderate climates. This temperature range supports physiological processes, including photosynthesis, water uptake, and nutrient assimilation, ensuring robust development. It is crucial to minimize fluctuations within this range to prevent stress and maintain a stable growth environment.

Agathis robusta thrives in well-drained soil to prevent root rot. Ensuring proper drainage helps maintain healthy roots, facilitating the plant’s growth and stability. Nutrient-rich soil is crucial for the robust growth of Agathis robusta, providing essential nutrients that bolster its development and resilience against environmental stressors. Moderate moisture retention in the soil helps maintain an optimal hydration level for Agathis robusta without risking waterlogging, promoting healthy and balanced growth.

For Agathis robusta, fertilizer application should be made cautiously. Use approximately 100 grams of a balanced slow-release granular fertilizer per square meter once every six months. Liquid fertilizers should be diluted to half-strength and applied with care to avoid nutrient burn.

For pruning Agathis robusta, it’s essential to use sharp and clean pruning shears or a handsaw. Sharp tools make clean cuts that heal faster and the cleanliness prevents the spread of disease. Ensure your tools are suitable for the thickness of the branches you plan to prune. Begin by removing any dead, diseased, or broken branches, cutting back to healthy wood. Use the 'three-cut method' for larger branches to avoid tearing the bark. This method involves an undercut, followed by a top cut a bit further out, and then removing the stub cleanly. When shaping your Agathis robusta, aim for an open crown to improve air circulation and light penetration. Prune selectively, maintaining the natural form of the tree while removing any crossing or inward-growing branches that could impede airflow or sunlight. More About Pruning Techniques→