Q.Mexican sunflowers are, one-by-one, starting to wilt and die
I started about 2 dozen from seed, set them about 2 weeks ago at 6-8 inches. Now some are wilting and dying, 3 so far.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on May 19, 2020
It could be from a burrowing animal or a fungal disease such as verticillium wilt.
These articles will help you: https://www.gardeningknowhow.com/plant-problems/pests/animals/vole-control.htm
https://www.gardeningknowhow.com/plant-problems/disease/verticillium-wilt-treatment.htm
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