Closeup of Violet Hydrangea on green leaf background. If you prefer Violet blooms, your hydrangea should be deprived of aluminium by growing it in an alkaline soil with a pH of 6.0-6.2. You can apply a high-phosphorus fertiliser to further discourage the uptake of aluminium. To raise the pH of a naturally acidic soil, apply Garden Lime at the rate specified on the package. To change hydrangea flowers from blue to pink, you need to remove the aluminium from the soil. The only way to do this is to add garden lime to soil to help raise the pH. Sprinkle 3 to 4 cups of garden lime around the base of the plant. Flower species that prefer alkaline soil such as geranium, begonia, and hydrangea should be watered occasionally with a weak baking soda and water solution. Sprinkle baking soda lightly around your tomato plants. ... If you have cut flowers, dip them in a solution of baking soda and water to lengthen their life.
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