news MustGrow Isolates and Concentrates a Mustard-Derived Molecule that Acts as a Systemic, Non-Selective Bioherbicide Investing News Network March 03 | 2021 MustGrow has isolated and concentrated a new mustard-derived extract, thiocyanate. Thiocyanate is soil active and translocated in the plant as a systemic, non-selective bioherbicide (natural weed-killer). Greenhouse weed treatment studies have commenced with this new bioherbicide extract.