This Is My Blue Endless Summer Hydrangea

My Endless Summer hydrangea coming into bloom

So why is the blue florist hydrangea I purchased pink? I know the answer is the pH of my soil. A spring soil test from the soil testing lab at Auburn University (boxes available to send off samples at Hanna Center at the Birmingham Botanical Gardens) was 6.9. That means that my garden soil is slightly alkaline. Hydrangeas planted in soils that tend to the alkaline side generally produce pink in color while those planted in more acid soils (6.0 and below ) tend to exhibit the blue color. So how can I get my pink Endless Summer to become blue again? I need to apply a soil acidifier, but not now. You will need to wait until early spring and apply according to label directions. I suggest you buy a soil acidifier expressly for this purpose, and it is available at almost all garden centers. FYI, the product you purchased is sulfur. But I like this packaged product because it tells you when and how much to apply. Now in reverse if your hydrangeas are blue and you want them pink, lime them in late fall and again in early spring with a like product that shows pink florist hydrangeas on the package. Neither of these products are an instant cure, but they will, over time, give you that beautiful blue or pink florist hydrangea color you wanted for your garden.

John Floyd

John Floyd has been gardening--and learning about Birmingham area gardening--for more than 30 years. In addition to his day-to-day experience, John has degrees in horticulture from Auburn and Clemson Universities and was Editor-in-Chief of Southern Living.

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