Why is Green Shoots foam herbicide such an effective brush killer? This presentation explains why. As shown, there are 3 primary reasons Green Shoots Foam Herbicide is so effective: First, foam herbicide is highly precise; second, foam herbicide clings tenaciously to the target plant; and third, foam herbicide dries slowly allowing the herbicide to fully absorb into target weed. We also provide you with examples of different kinds of brush that can be effectively killed with foam herbicide.