
Certified GKH Gardening Expert
Unfortunately, your photo did not come through. I am unable to see the damage. It could be something as simple as nutrient deficiency, or something a little more complicated like an infection.
The first steps will be to test your soil for deficiency and pH swings. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
This article will help you with the care of the plant:
https://www.gardeningknowhow.com/edible/herbs/epazote/epazote-herb-growing.htm