A true standout among summer bloomers is Albizia julibrissin, commonly known as the Persian silk tree or mimosa. Native to Iran, Korea, and Japan, this deciduous tree is becoming increasingly popular in Europe. Belonging to the Fabaceae (legume) family, it is valued for its elegant foliage and showy flowers, reminiscent of Acacia or Mimosa. With its beautiful leaves, striking blossoms, and broad crown, the tree brings a distinctly Mediterranean atmosphere—making it a perfect highlight for August.
Characteristics
The Persian silk tree typically grows 8–15 meters tall with a wide, spreading crown 7–10 meters in diameter. Its fan-shaped canopy is formed by almost horizontal branches. The bark is smooth and gray, while young shoots are green, turning gray-brown with age.
Its airy crown is created by bipinnate leaves up to 40 cm long, with individual leaflets 2–3 cm in length. Fresh spring foliage is light green, darkening as summer progresses. At night, the leaves fold together—hence the Dutch name slaapboom (“sleeping tree”).
From July through August, the tree produces masses of fragrant pink to whitish-pink flowers in striking clusters at branch tips. The flowers resemble fluffy pom-poms thanks to their silky stamens. After flowering, flat, papery pods 15–20 cm long appear, each containing rows of black seeds. Full sun is essential for good flowering, and in cooler summers the display may be less abundant.
Uses and Applications
Increasingly popular, Albizia is planted to create a Mediterranean ambiance. Its broad, light-transmitting canopy also provides pleasant shade in gardens, though space is needed to accommodate its spread. It thrives in full sun on sheltered sites, tolerates many soil types, and is both heat- and drought-tolerant once established.
Beyond its ornamental value, the Persian silk tree has a long history in traditional Chinese medicine. Its bark, flowers, and seeds are used in herbal remedies for ailments such as anxiety, depression, and insomnia. The bark is especially valued for its calming properties and is often used to make teas and tinctures.
Biodiversity and Ecological Value
Like all members of the Fabaceae family, Albizia julibrissin improves soil health by fixing nitrogen from the air. Its blossoms are an important nectar source for bees and pollinators during midsummer, when few other trees are in bloom. The seeds also provide food for various bird species.
Conclusion
Albizia julibrissin, the Persian silk tree, is a beautiful and versatile species long cultivated in Mediterranean countries for both decorative and medicinal purposes. With its parasol-shaped silhouette and tropical charm, it is well worth planting in sheltered, sunny locations.
