Please can someone help.
I have 2 lovely climbing hydrangeas that I bought for the lovely big white flowers it got. They are both over 6 foot tall now and late really healthy. They are on trellis on a north facing wall attached to my shed.
What do I need to do to help these flower?
Wait - they take a while to get going, then they'll be smothered in blooms - probably next year
Time and patience is indeed the answer, mine took a few years to get climbing and flowering - be aware they can get very heavy so be sure your trellis is weighty enough for the job. They will flower all in their own good time, and are well worth the wait.