Soil PH +, - - Knowledgebase Question

West Hills, Ca
Question by parkerke
March 21, 2009
I have a new pink hydrangea and would like to make it blue. The directions I have found said to make the soil acid. How do I do that?

Answer from NGA
March 21, 2009


To make hydrangeas blue in alkaline soil you need to acidify the soil by adding sulfur (aluminum sulfate). It takes several months for this to work its way into the soil and change the pH so applying it now won't change the color of this years blossoms. But, applying now will help next years blooms. It takes only about 3 TBS per foot of soil to make the change; sprinkle on top of the soil and then water it in well. Best wishes with your garden!

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