In 2015, the Northwest Crops and Soils program of the University of Vermont Extension began studying high glucosinolate mustard as a biofumigant and cover crop in vegetable cropping systems to see its effect on weeds, disease, and yield. As part of a Vermont Agency of Agriculture Food and Markets Specialty Crop grant, Dr. Heather Darby, her team, and a participating grower compared four high glucosinolate mustard varieties over four planting dates.