My Mexican Sunflower Is Turning Yellow And Brown On The Inside And Bottom Of Plant, The Rest Looks Great.

Question

What’s going on and how can I stop this? I have no more details

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Answer 1

I see signs of infection. Because they are very drought prone, I would not offer them any water, outside of rainfall. If you do not supplement at all anyway, then you may have to keep fungicides handy. Treat, very constantly.

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/flowers/mexican-sunflower/planting-mexican-sunflowers.htm