Hi all, I have a Passion Flower called 'Victoria' which I bought a few years ago, was flowering last year, but since last winter it's dropped all of it's leaves, as you can see from the photo the stems are still green so it's still alive.

I did try to plant it in new soil in the hope it would spring back into life, but no luck yet. It does reside in a shady part of the patio.

Can anyone tell me why it's laying dormant? As I thought these were supposed to be evergreen, any advice?