Why does my Climbing Susan Vine have yellow leaves?

Question

I was fertilizing it regularly with 15-30-15 and kept it moist. In August the leaves began to turn yellow and it stopped flowering. I have since repotted it with new looser soil (because I read that the roots can bunch up and don’t like being soggy) and stopped fertilizing. It is now flowering a bit but the leaves remain yellow.

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Answer 1

Given your growing zone, I feel that the vine may be just beginning to wind down for the winter; in colder zones, this vine will be more of an annual and not likely to winter over.

https://www.gardeningknowhow.com/ornamental/vines/black-eyed-susan-vine/black-eyed-susan-vine-care.htm

The leaves also look like they are exhibiting the look of iron chlorosis.

This article has more information.

https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm

You could save seeds from your plant to plant next season!