Every time you visit a farm, orchard, or nursery you MUST clean and disinfect your footwear or leave them behind. Anything less almost certainly means spreading weeds as this article from the Progressive Farmer exposes.  “We planted the mud from two pairs of boots in a greenhouse flat.  “It really wasn’t all that much mud. What it shows though is that it doesn’t take much to move weed seed.” Read the full story on the Progressive Farmer website: https://www.dtnpf.com/agriculture/web/ag/blogs/production-blog/blog-post/2021/05/26/dirty-little-secrets-weeds-move