Soap-bark (Quillaja saponaria)

Soap-bark

Also known as: Quillay

Soap-bark is an evergreen tree indigenous to warmer regions of South America. Renowned for its rough, exfoliating bark and clusters of white flowers, this tree thrives in well-drained soils, reaching heights of up to 15m. Its thick, glossy leaves aid in water retention, while soap-like compounds within its wood and bark form a unique line of self-defense against herbivores.

Scientific classification

Species

Soap-bark (Quillaja saponaria)

Legumes, milkworts and allies

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Perennial

Lifespan

Tree

Plant Type

Winter dormancy

Dormancy

Quickly Identify Soap-bark

Slender tree reaching 30-45 feet (9-14 meters) with drooping branchlets.

Bright green oval leaves with slightly toothed margins, becoming smooth near base.

Greenish-white star-shaped flowers in late spring to mid-summer.

Distinctive 0.75 inch (1.9 cm) wide, five-lobed, pinwheel-shaped fruit by fall.

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Care Guide for Soap-bark

Every week

Water

Full sun

Sunlight

15 - 35 ℃

Ideal Temperature

Water: Soap-bark, originating from Chile's arid regions, exhibits high drought tolerance and thrives with minimal water. Watering weekly is sufficient for cultivated specimens. As an evergreen, it benefits from consistent soil moisture, making it ideal for both outdoor landscapes and indoor settings.

Pruning: Prune soap-bark in early to late winter while dormant, focusing on dead or diseased branches to improve air circulation. Regular pruning promotes healthier growth and blooms. Use clean, sharp tools to avoid infections, enhancing the plant's structure and visual appeal.

Propagation: Soap-bark is appreciated for its medicinal bark and saponin content for soap making. For propagation, use semi-hardwood cuttings treated with rooting hormone, planted in well-draining soil. Maintain high humidity and moderate watering to promote root growth, allowing established plants to adapt effectively.

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