Answer: What you describe is perfectly normal for your PJM. A reddish cast can indicate exposure to cold temperatures, a nutrient deficiency, or simply a natural aging of the leaves. Make a note on your calendar to feed your rhodie next spring just as new growth begins. Use an acidified fertilizer - one formulated especially for rhododendrons and azaleas - and apply in amounts as recommended on the label.
Best wishes with your garden!
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