These things hitchhike in soil (flowerpots etc.). Soil solarization strategies might help, from the simplest (placing black plastic sheeting over recently turn

These things hitchhike in soil (flowerpots etc.). Soil solarization strategies might help, from the simplest (placing black plastic sheeting over recently turned-over soil on hot days) to building a black-plastic lined box with a clear plexiglass cover for smaller volumes. There are a lot of how-to YT videos etc.