We have a Passion Flower (looks like Passiflora foetida) which did
nothing for years, and then two years ago exploded into flowers, and
wound itself all over the place.

Same again last year - by the end of which it was threatening to take
over that corner of the garden, and so I cut it back with shears.

It didn't seem to like that, because it was sulking for most of the
start of this year, and then rallied in early September, flowered, and
wound around in a healthy way.

What would you say that I'm *supposed* to do with it? One of my
gardening books says shortly: "Do not prune".

Perhaps I pruned at the wrong time, last year?

Cheers
John