Silk Tree (Albizia julibrissin)

Silk Tree

Albizia julibrissin

A fast-growing deciduous tree celebrated for its fern-like foliage and fluffy, pink, thread-like flowers. Other names: Mimosa tree.

Requires full sun for optimal blooming and growth, though it can tolerate light partial shade.
1/week
Easy
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Plant Needs

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Sunlight Requires full sun for optimal blooming and growth, though it can tolerate light partial shade.
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Watering Highly drought-tolerant once established; water deeply but infrequently.
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Temperature Hardy in USDA zones 6-9; tolerates high summer heat well.
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Characteristics

  • Leaves: Bipinnately compound, 20-45 cm long, with numerous small, crescent-shaped leaflets that fold up at night or during rain;
  • Flowers: Dense corymb-like inflorescences lacking petals, featuring conspicuous, showy pink to white stamens resembling silky threads;
  • Bark: Smooth, greenish-grey to light brown, developing shallow fissures with age;
  • Fruit: Flat, papery seed pods, 10-20 cm long, turning brown in autumn and persisting into winter.
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Care Guide

Watering

Water deeply when the top 2-3 inches of soil become dry, especially during prolonged dry spells.

Fertilization

Apply a light layer of compost if soil is extremely poor; otherwise, no fertilizer is needed.. As a legume, it fixes its own nitrogen and rarely requires supplemental feeding.

Banana Peel Tea:Steep chopped banana peels in water for 24-48 hours. Dilute 1:1 with water and apply to the base. Avoid high nitrogen materials as this tree fixes its own nitrogen.
Pruning
  • Prune in late winter or early spring while the tree is dormant;
  • Remove dead, diseased, or crossing branches to maintain an open, umbrella-like canopy;
  • Trim low-hanging branches to raise the canopy for pedestrian clearance if planted near walkways.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Seed pods contain alkaloids that can cause gastrointestinal and neurological issues.

Humans: Generally safe, though ingesting large amounts of seeds may cause mild stomach upset.

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Garden Uses & Culture

Culture: Introduced to Europe in the 18th century by Filippo degli Albizzi, it became a popular ornamental in Victorian gardens for its exotic, delicate appearance and umbrella-like canopy.

Usage: Widely used as an ornamental shade tree in landscaping, though its wood is sometimes used for small woodworking projects.