Azaleas and Rhododendrons are close relatives with nearly identical needs. Their native location is at the edges of forests, with lots of organic matter in the soil (leaf mold, etc.), very good drainage, and acid soil (pH of 4 to 5.5). They do not tolerate hot sites or winter winds. Rhododendrons prefer dappled light, while Azaleas like lots of sun during the growing season. Ample moisture is necessary for both. In Minnesota, the hardy 'Northern Lights' series of Azaleas was developed beginning in 1957.
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