When hydrangeas come in nicely, they are a bold, beautiful color, usually bluish-purplish with a touch of pink. When they don’t come in well though, they are usually a pale, watered down blue with a yellowish tinge—not nearly as impressive. If you want to get your hydrangeas back in all their colorful glory, it turns out it’s just a matter of fixing the pH of your soil. In fact, if you add garden lime, you will turn them pink. If you add soil acidifier, you will turn them blue. There are even products you can purchase to do just that, which makes it super easy! Add the right kind of fertilizer, and you will get the effect you are aiming for.