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Formosa AzaleasAzalea indica 'Formosa'

  • Formosa Azalea - Azalea indica Formosa shrub
The Formosa azalea is a southern Indica variety. It is hardy, spreading evergreen shrub with an upright habit. It is a slow grower, 6'-8' or taller with slightly less of a spread. The beautiful flowers are a single, large, 3", funnel shaped, magenta color with a darker blotch. It prefers partial shade to full sun, acidic, well drained soil, and protection from the wind. It is drought tolerant when established, but will require watering during prolonged droughts. Pruning is seldom necessary, but any pruning should be done after flowering. The flower's buds are on the previous year's growth.

Hardiness Zones

The formosa azaleas can be expected to grow in Hardiness Zones 8–10. View Map

Tree Type

Mature Size

Formosa azaleas grow to a height of 6–8' and a spread of 4–6' at maturity.

Growth Speed Slow Growth Rate

This shrub grows at a slow rate, with height increases of less than 12" per year.

Sun Preference

Full sun and partial shade are best for this shrub, meaning it prefers a minimum of 4 hours of direct, unfiltered sunlight each day.

Soil Preference

Formosa azaleas prefer acidic, moist, well-drained soil but tolerates periodic dry soil once established.


This shrub:
  • Produces 3" funnel-shaped magenta flowers, each with a darker accent blotch, that bloom in the spring. In some areas, the plant will bloom again in the fall.
  • Features elliptical, medium green leaves 1½" in length that persist throughout the year.
  • Grows in a rounded shape.
  • Should be protected from the wind.
  • Works well as a mass planting, specimen, foundation plant, border or hedge.

Wildlife Value

The flowers attract butterflies and bees.


This shrub comes from southern India.