For more information on the beginning steps to a healthy azalea, refer to Azalea Planting , HGIC 1058. Azaleas planted beneath hardwoods with shallower roots must compete with these trees for nutrients and water. If placed in the right location, however, they can do well on these sites. Although some varieties tolerate sun better than others, they all prefer an area that is not exposed to long periods of hot full sun and drying winds. Flowers last longer when plants are partially shaded.
Azaleas exposed to full sun are more susceptible to lace bugs.
Early morning sun exposure after a hard freeze may cause cold injury. Do not plant azaleas in heavy shade as poor flowering and weak growth result. SOIL Azaleas are shallow-rooted plants that are easily damaged by excessive soil moisture. Before planting, have the soil tested and adjust the pH according to soil test results. Azaleas located in poorly drained sites do not receive the oxygen required for healthy growth and often develop root rot diseases.