I wanted to know if I could put something on the split. Never got an answer...
Passion Flower Trunk Is Split
Certified GKH Gardening Expert
Splitting of the main trunk of a passion flower vine can be a sign of Fusarium disease. This may require replanting since I don't think it can be cured.
It is best not to put anything over the split. Plants with split trunks or limbs typically heal better if nothing is placed over the wound.