Needless to say not all varieties of hydrangeas can change coloration from pink to blue. When you have varieties apart from bigleaf or mountain hydrangeas, no quantity of aluminum sulfate goes to alter the colour. Darker reddish pink and really deep blue flowers, together with white blooms, won’t be affected by soil components.
When you have the appropriate selection, nonetheless, you can provide this hack a go. Simply combine 1 tablespoon of aluminum sulfate with 1 gallon of water and soak the bottom of the plant as soon as every month for 3 months. One of the best time to do that is within the springtime or the start of the summer time months in your space. You may as well wait until the autumn and sprinkle 1/2 cup of wettable sulfur over each 10 sq. ft of soil the place your hydrangeas are rising, then water the world so the additive seeps down into the bottom. That is the place endurance comes into play. It may possibly take months and even as much as a yr for the colour change to happen.
Questioning how one can change them again to pink once more should you resolve you want that higher? The identical course of is utilized within the spring mixing 1 tablespoon of hydrated lime with one gallon of water (as a substitute of aluminum sulfate). Or, you’ll be able to add 1 cup of dolomitic lime over 10 sq. ft of floor earlier than watering your vegetation.