When Do You Fertilize Rhododendrons?

“When is the best time to fertilize Rhododendrons?” Question from Carin of Fall Creek, Wisconsin

Answer: When it comes to questions about Rhododendrons and Azaleas, even experts like me turn to the American Rhododendron Society. Their goal is to teach gardeners how to make the most of these beautiful flowering shrubs. Their advice follows that of professional growers: if the plants look happy, perform well, and have fertile, well-drained soil that is slightly acid, then there is no need to feed them. Excess fertilizer can actually damage their roots. But, if your soil is sandy and poor, then I recommend amending it with Black Gold Peat Moss and Garden Compost Blend to increase water- and nutrient-holding ability. From there fertilize in the early spring with a food formulated for acid-loving plants, like rhododendrons. (Click here to read more.)

I hope that these tips help!

Happy gardening,

Jessie Keith

Black Gold Horticulturist


Plants are the lens Jessie views the world through because they’re all-sustaining. (“They feed, clothe, house and heal us. They produce the air we breathe and even make us smell pretty.”) She’s a garden writer and photographer with degrees in both horticulture and plant biology from Purdue and Michigan State Universities. Her degrees were bolstered by internships at Longwood Gardens and the American Horticultural Society. She has since worked for many horticultural institutions and companies and now manages communications for Sun Gro Horticulture, the parent company of Black Gold. Her joy is sharing all things green and lovely with her two daughters.

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