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Ageratum houstonianum
Narrow spade-shaped leaves grow low on the body with lilac-purple hair flowers in clusters at the top of the stalks.
Pastureland
It could also be C. coelestinum, which is native, though I have not seen it with such dark stems, which is why I went with A. houstonianum. The ageratum will not survive the winters of Kentucky so if removed before setting seed easy to eradicate. They are difficult to distinguish from a photo, but if animals grazing there I say better safe than sorry.
Thank you for the heads up. It is currently being used for hay, but is close to the active pasture for the dairy cows. To know it is introduced makes it easy to destroy without remorse.
If this is an active pasture and you have animals grazing there, I would immediately remove all traces of this plant, it is toxic to grazing animals.
Spotted on Sep 3, 2012
Submitted on Sep 4, 2012
