Above the surface plants crowding need controling? Rodeo Herbicide is effective on nearly all Emergent Plants like Cattails, Grasses, Bulrushes, Purple Loosestrife, Aligatorweed and Water lilies. Rodeo is systemic - kills the roots for multi-year control. There is not a more economical way to control tall weeds. Mix the Rodeo concentrate with water and a non-ionic surfactant (Cide Kick Surfactant) and apply by using a back pack or hudson type sprayer. For Cattail or Lily control wait until plants are mature. Apply to dry plants. No water use restrictions. Rodeo Herbicide is a very popular glyphosphate herbicide for the control of aquatic weeds and plants. Rodeo Herbicide is effective on nearly all emergent plants like Cattails, Grasses, Bulrushes, Purple Loosestrife, Alligatorweed. Rodeo is systemic - kills the roots for multi year control. There is not a more economical way to control tall weeds. Mix the Rodeo concentrate with water and a non-ionic surfactant (Cidekick) and apply by using a back pack or Chapin sprayer. For Cattail or Lily control wait until plants are mature. Apply to dry plants. No water use restrictions.