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What is this weed in my lawn? #867605

Asked May 08, 2024, 2:44 PM EDT

This is an annual weed that is taking over sections of the lawn (both in sunny and shady locations). Stems are red as they grow. Mature plant has a substantial stem and a fairly long tap root. Thanks for any help!

McLeod County Minnesota

Expert Response

Thank you for writing.
That is knotweed. https://apps.extension.umn.edu/garden/diagnose/weed/broadleaf/creeping/pknotweed.html
There are two ways to look at a weed like this.  First, it is a weed to treat with herbicides.
Or, it is a sign that your grass is not being cultivated in a way to best keep weeds from invading. I can't comment on this without knowing more about your lawn care. 
https://extension.umn.edu/lawns-and-landscapes/lawn-care
Steve Miles, Master Gardener, Hennepin County MN (I am a human being, not a bot nor AI). I am an avid gardener but am not a degreed or certified horticulturist or arborist. I am happy to receive follow-up questions if my responses are incomplete or unclear.  This is the University of MN' garden soil testing service.  https://soiltest.cfans.umn.edu/testing-services/lawn-garden This is guidance on how to find a tree expert.  https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional The Minnesota Landscape Arboretum is a wonderful place to see and learn about plants that grow in Minnesota. https://mngardens.horticulture.umn.edu/minnesota-landscape-arboretum Replied May 08, 2024, 2:54 PM EDT

Thanks Mr.Miles for your prompt response to my question about knotweed. I've look at countless images trying to figure it out. Thanks for the additional information you provided! I have an idea on how to proceed.

The Question Asker Replied May 08, 2024, 7:01 PM EDT

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