Twice a year I use Holly Tone fertilizer around my Endless Summer hydrangea plants. They are showing fewer blooms every year (they've been in the ground 4 years). I have not pruned except to remove completely dead branches. My husband made wood framed tepees to cover each on over the winter (we live in Manlius, NY). I have heard there is another fertilizer that will encourage blooming, but can't remember what it was. Can you please help?
My Hydrangea Is Not Blooming
Certified GKH Gardening Expert
You may be thinking of phosphorus. If there is a lack of phosphorus in the soil, plants will have little to no blooms. You can either use a phosphorus rich fertilizer or add some bone meal to the soil. These articles may help as well: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm, https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm