Ed Rosenthal, a noted American horticulturist, author, and publisher, developed a line of natural pesticides called Zero Tolerance.
This pesticide has been formulated from food-grade cinnamon, clove, rosemary, and thyme oils to create a powerful tool for killing and repelling plant pests and pathogens. It is designed to be used repeatedly and will kill on contact while deterring future pest activity or fungal growth.