Fiesta weed control is the only registered product which is approved for use on weeds in Ontario. Fiesta is a liquid iron product that works on contact so weeds have got to be present and come into contact with the product in order to be absorbed. The weeds die quite quickly with fiesta. Since fiesta is not a preventive weed control, lawns will experience more growth throughout the season and for this reason, we apply weed control as a season long control “in our programs” without charging extra. Fiesta was designed for broadleaf weeds such as plantain and dandelions but we have manipulated the product so we can manage most other weeds.