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In Illinois, Rhododendron prinophyllum is usually found on acidic, rocky soils in the understory of oak and oak-shortleaf pine forests. Common companion plants include small red maples (Acer rubrum L.), sour gum (Nyssa sylvatica Marsh.), flowering dogwood (Cornus florida L.), farkleberry (Vaccinium arboreum Marsh.), and the low-bush blueberry, Vaccinium vacillans Torrey. The azaleas often grow on north or west-facing slopes and generally do not flower well except along the edges of trails or where the forest was thin.
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