Formosa Southern Indica Azalea Azalea Southern Indica 'Formosa' A beautiful evergreen azalea with a large, upright growth habit. Masses of single, 3" magenta flowers with deep blotch bloom in spring. Best for high light areas. Exposure: Part sun to shade. Growth: Vigorous upright grower. This plant has shallow roots and should have mulch spread around it to preserve moisture. Cold Hardiness: 10 to 20 degrees F. Landscape Use: Best in masses.