Q.Every year the Dutchman’s vine grows. This year with a lot of rain it is not growing. WHY?
It is over 70 years old. It shades the porch. Never had a problem.
Certified GKH Gardening Expert
Wow! A 70-year-old plant is fantastic! I doubt the increased rainfall harmed the pipevine because they like moisture. However, they also like well-drained soil. You don't say it's failing, just not growing. Even though native plants don't require much, if any, fertilization, after 70 years, that site could be depleted. Have you considered a soil test to check the nutrients in the soil? Your local extension service can help with one. Also try pruning the vine to encourage new growth. Here are basic facts:
https://plants.ces.ncsu.edu/plants/all/aristolochia-durior/