Rodeo is a herbicide with 53.8 % Glyphosate† N-(phosphonomethyl) glycine, isopropylamine salt active ingredient, which effectively targets emergent aquatic nuisances from Cattails, Grasses, Bulrushes, Purple Loosestrife, Aligatorweed and Water Lillies. Rodeo is systemic - it kills the roots for multi-year control. There is not a more economical way to control tall weeds. For best results, mix the Rodeo concentrate with water and a non-ionic surfactant, and apply by using a back pack or Hudson type sprayer. For Cattail or Lilly control, wait until plants are mature. Apply to dry plants.