Mexican sunflower stands tall with fall color

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Sunflowers are blooming now. But there’s another type of sunflower you might not know about. It’s called Mexican sunflower, and it blooms beautifully in the fall. On this edition of Get It Growing, LSU AgCenter horticulturist Dan Gill explains why this tall native of Mexico can make a great addition to your landscape.
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As much as I enjoy growing this Mexican Sunflower, I have encountered a lot of problems like various leaf spot diseases, rust, verticillium wilt, powdery mildew, and worst of all, stem rot, also known as white mold. Do you have any suggestions on how to treat the problems? Thank you.

binhminh
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What about planting them in pots?I have some in pots that I planted in May. Its close to 2.5 months now & they haven’t bloomed ; growth is also slow. They are in 6 inch pots right now.. Do you think I should move them to 9 inch? Do the roots grow deep ?

priyanka