"stuart noble" wrote in a reply:

I'm trying hydrangea seemani on a shady fence and it's progressing upwards
in an orderly fashion without support. Haven't seen any flowers yet, but
that would be a bonus.

I know a house with a north facing front that has Hydrangea petiolaris
smothering the wall. That's the one with creamy-white flowers. Given
time, it would easily cover Clive's garage wall.

MD.