Farm General 53.8% Glyphosate is a post-emergent, systemic herbicide with no soil residual activity. This grass and weed killer is generally non-selective and gives broad-spectrum control of many annual weeds, perennial weeds, woody brush, and trees. It is formulated as a water-soluble liquid. It may be applied through most standard industrial or field-type sprayers after dilution and thorough mixing with water or other carriers according to label directions.