Hydrangeas in bloom are among the most eye-catching plants in the garden. They add color and interest through summer and into fall. When your hydrangeas aren’t blooming you can’t help but feel like something is completely missing from the garden. There is usually a fairly simple explanation for a lack of blooms. Some species of hydrangea grow each season off of new wood and some grow off of old wood. The first step is to make sure you know which variety you have planted. Along with knowing the variety, it’s important to be sue you have planted the right plant for your growing zone. This can also be the reason for wimpy blooms.
Check out this informative link from Proven Winners that gives you a step by step chart to clear up any hydrangea questions you might have.