I recently got into gardening and one of my favorite plants is Mexican flamevine (Pseudogynoxys chenopodioides). Recently the leaves have been changing color from green to red/brown/black and I don't know what is causing it and how to fix it. If anyone could give a new gardener some tips, I would greatly appreciate it!
This is most likely cold damage - Senecio confusus, or Mexican Flame Vine, dies completely in Zones 8 or below, and is grown as an annual rather than a perennial there - optimum low zone would be 9a. It is grown in colder areas, and can be kept over winter if it's brought into a warmer environment during the cold season. If you had a temperature of 36degF, there would have been frost,and that could be the damage you're seeing. If it gets colder than that, your plant will likely die back to the ground, but if you are in Zone 9 or above, it should regrow next spring. https://monarchbutterflygarden.net/butterfly-plants/mexican-flame-vine/