What do I use to change the color? I read something but cannot find it now.

Endless Summer has several resources to help gardeners learn about changing a hydrangea’s flower color. First, you need to start off with healthy blooming plants – our planting and care guide is full of tips. Then, check out my hydrangea soil science video for insight on why hydrangea flowers change color and the impact of fertilizers and soil amendments. Finally, learn about our products Color Me Pink and Color Me Blue. Do all this now, and you will be ready to play with the flower color next year.