The mode of action inhibits a key enzyme in chlorophyll production. This causes cell membranes to rupture and rapidly disintegrate within hours. Highly recommended to use Microyl Crop Oil Replacement with this product to increase effectiveness. Fast weed control - weed death can occur within 7 to 14 days Outstanding broadleaf weed control for turf Visible activity in hours Effective, fast-acting cool-weather product Clover control in as little as 1 week Rain-fast in 3-4 hours Reseed in 1 week Low-odor formulation. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Weed & Pest Control\Weed Control\Herbicides & Fungicides".The seller is "lawnandpestcontrol17" and is located in this country: US. This item can be shipped to United States.