Hi Peter,

Do you have reason to suspect herbicide damage, or was an herbicide product used this past winter/early spring in your yard? Microclover is known to be sensitive to drought especially after prolonged periods, and the top of clover is known to be susceptible to winter kill. Below, I have included two additional references which provide more information on clover and lawns.

• University of Maryland extension: https://extension.umd.edu/resource/lawns-and-microclover
  
• University of California:https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=40766

I have concerns about an angry neighbor who has made veiled threats and wished all of my plants would die. Also, I purchased two ELISA glyphosate test kits from https://detoxproject.org/.  One section of the yard tested positive for glyphosate and different section tested negative.  I contacted the manufacture of the test kits, Eurofins Abraxis, and they said the results were not valid and sent a new test kit.  I have not run the new test yet.

From your response I think the clover probably was winter killed.  I have reseeded the area although there is no new growth yet.

Thank you for you response.

That sounds like a very challenging situation. I am not familiar with detoxproject testing kits; however, I do know that some labs can run soil tests for 'contaminants'; a list of a few of these labs can be found in the following link. If you are interested, I would encourage you to contact a lab before taking and sending a sample: https://www.oregon.gov/ODA/programs/Pesticides/Documents/2020/AnalyticalLabsServingOregon.pdf