My hydrangeas have not leafed out yet. Just starting to sprout.
Can You Fertilize Plants That Have No Leaves Yet
Certified GKH Gardening Expert
You can feed your hydrangeas with an acid fertilizer when buds start to swell so that fertilizer is available as the plant leafs outs and come into its most active phase of growth.
For more information on fertilizing hydrangeas, please visit the following link: