Q.I have caterpillars on my Passion Vine
I have so many caterpillars on my Passion Vine they have eaten all but the bottom leaves off the vines. If I leave them, will they eventually kill my plants? Please advise.
No, they will not kill your passion vine - it will recover. Here is an article that will help you identify which caterpillar you have:
http://www.birdsandblooms.com/blog/passionvine-and-its-butterflies/
Lastly, here is an article that will help you on how to get rid of caterpillars (if you find them undesirable):
https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm