Herbicides For Roadside Flowers Links to chemical labels and MSDA sheets: Greenbook Useful Herbicides Post-emergent Herbicides (eliminates weeds from established roadside flowers) Pre-emergent Herbicides (prevents weed seeds from developing) List of herbicides that can be used on specific plants (PDF Format) Useful Links: North Carolina State University - Non-Cropland Weed Control National Roadside Vegetation Management Association - NRVMA