Hello all!

A few years ago I bought a grafted black passionfruit. To my dismay, the rootstock started shooting up runners all over the place, often at a great distance from the original plant!

Of course, the graft soon died, and now I'm left with the runners. I think the plant is probably P. Incarnata. I'm not going to try and eradicate it completely because that would be nigh impossible, but I would at least like it to flower. It's been about five years since it was planted and so far there hasn't been a single bloom!

Any tips on how to get this monster passion to flower?