Hello. I have searched the website and cannot find what I am looking for. I have three varieties of hydrangeas in large pots on my large terrace. Each year at least one does not bloom in the following spring even though it may be very leafy. I am looking for instructions on how to cut back the plants in the Fall so that they will rebloom again in the following year. I live on the west coast of Canada so there is occasional freezing periods but otherwise wet-moderate winters. Appreciate your direction or advice. Thanks
