>My Hydrangea petiolaris is at least ten years old and growing up the north >side of our garage. Additional shade is provided by a healthy crab apple >tree and a Viburnum. The Hydrangea has never ever shown even the slightest >interest in blooming. So some sunlight must be necessary. > Carolyn Try a light pruning, I've had one in a similar location and that what started it to bloom. John Kee Zone 4 or 5 where the snow is final gone.