Albizia julibrissin – Persian silk tree
Origins and characteristics
Native to Western Asia (Iran, China, Korea, Japan), Albizia julibrissin belongs to the Fabaceae family. Introduced to Europe in the 18th century, it quickly became a popular ornamental tree thanks to its unique appearance, heat tolerance and good hardiness. In Chinese tradition, its bark and flowers are used to calm the mind and ease anxiety.
Description and particularities
The Persian silk tree forms a wide, umbrella‑shaped crown with horizontal or slightly arched branches. Its finely divided compound leaves close at night or during rain. From June to August, it produces airy, silky pink flower tufts with a light fragrance. Foliage may turn pale yellow in autumn.
- Adult height : 5 to 7 m
- Spread : 6 to 8 m
- Habit : Spreading, umbrella‑shaped
- Foliage : Deciduous, bipinnate, very light, mid‑green
- Flowering : June to August
- Hardiness : Good (–17 to –20 °C depending on exposure and drainage)
- Growth : Medium to fast
Flowering
- Flowers : Silky pink tufts, very decorative
- Period : Summer (June–August)
- Fragrance : Light, sweet
- Interest : Highly ornamental, attracts bees and butterflies
Exposure and soil
- Exposure : Full sun, warm and sheltered from cold winds
- Soil : Light, well‑drained, neutral to slightly acidic
- Tolerates poor, stony, slightly dry soils
- Does not tolerate winter waterlogging
Planting
- Plant in spring or early autumn in mild regions
- Choose a sheltered, free‑draining location
- Add compost at planting
- Mulch to retain summer moisture
Watering
- Regular watering during the first two years
- Afterwards, good drought tolerance
- Water during prolonged drought or in very sandy soils
Pruning
- No mandatory pruning
- Possible in late winter to shape the structure
- Avoid late‑season pruning (may reduce flowering)
Propagation
- By seed (easy after soaking)
- By cuttings or grafting for cultivars
- May self‑seed in warm climates
Garden uses
Perfect for :
- Sunny or dry gardens
- Specimen planting to shade a terrace or lawn
- Mediterranean or exotic borders
- Combinations with lavender, salvias, cistus, grasses, figs, agapanthus
Additional interest
- Traditional medicinal plant in Asia (relaxing properties)
- Summer flowering extends garden interest
- Unique shape ideal for calm, contemplative spaces
Disease resistance
- Generally healthy
- Watch for :
- Late frost on young shoots
- Chlorosis in alkaline soils
- Root rot in poorly drained soils
Tips for good growth
- Choose a warm, sunny location
- Excellent drainage is essential in cold climates
- Mulch in winter in marginal regions
- Protect young trees for the first 2–3 winters
Albizia julibrissin, the Persian silk tree, is a poetic and spectacular small tree that brings an exotic, airy atmosphere to sunny gardens. Its pink summer blooms, mimosa‑like foliage and umbrella habit make it both elegant and highly sought after.