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I've never grown angelica, or seen anyone else growing it.

What diseases should I look for when growing it?
How do I cure the disease to make the plant healthy again?

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Angelica atropurpurea is native to MN.

Easily grown in medium to wet soils in full sun to part shade.

A large herbaceous perennial which grows from 3-10' tall with smooth, dark purple or purple-blotched stems. Native to wet areas of Minnesota Features tiny greenish-white to white flowers arranged in large, compound umbels Flowers bloom in summer.

According to Missouri Botanical it has no major pest or disease.

It might get powdery mildew at the end of the season. Which is fine, because it is at the end of the season. Just go ahead and cut it to the ground. That is better than trying to treat a plant that is trying to wind down for long winter sleep.

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As I recall, you are in USDA zone 4a -this plant is only hardy in zones 5 - 9, some sites say zone 9 only, and if you''re growing it for the roots, it takes three years for the plant to mature, so the biggest problem you'll have is keeping it alive at all for any length of time. Growing in pots is not an option because it puts down a very long taproot, which also means, in places where the climate is right for it, it's difficult to eradicate. https://www.gardeningknowhow.com/edible/herbs/angelica/growing-chinese-angelica-plants.htm

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