so how do you drill a spring crop with perrenial weeds without glyphos ?Can’t compare frost to glyphosate. While annuals finish their annual cycle with a hard frost, perennials and any soil critters living in those environments are adapted to frost. It doesn’t kill them, they just enter a dormant stage in their life cycle. Glyphosate can kill them, which is the end of a life cycle, not a stage in it.