LITTLE ROCK, Ark. (KTHV) - There is one shrub that I get emails about constantly, and that is Hydrangeas.
You can manipulate the soil for certain types of Hydrangeas so that they change color. This is the time of year that I will start to fertilize mine with Aluminum Sulfate. This will help make your soil more acidic, which is what gives us that bluer color. Most of the time, the more acidic your soil becomes, the more blue to purple your Hydrangeas will be.
Now what if you don't want your Hydrangeas blue? What if you want them pink? All you have to do is make your soil the exact opposite--more Alkaline. You can do that by buying bags of lime, which you can find at most of your garden centers. Lime will make your soil more Alkaline, and you will have pinker Hydrangeas. Now once your Hydrangeas turn pink, don't apply too much Lime because you can overdo it.
Now remember there are lots of varieties of Hydrangeas out there as well that will stay their color. Ever bloomers, such as endless summer Hydrangeas, come in Blue, Pink and many different colors that will bloom on and off throughout the entire spring and summer.
Remember to prune your Hydrangeas around George Washington's birthday.