This could be a few different issues. Do you fertilize at least once per year? Is this in container or ground? This is mostly caused by under fertilization, but can be a fungal/bacterial infection, also. A photo will help me to make a better judgement call. In the meantime, this article will give you more information: https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm
Answered on May 14, 2019
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