There are several products with the same active ingrediants, but I'm not sure if you'll find them in the big box stores. Although they claim to have some post emergent killing capability, nobody recommends post emernance application. The window for application is narrow, and will move around depending on the spring weather conditions. I think soil temp of 55°F - 3" below surface. A general rule is to apply when the forthysia is done blooming. If you apply dry, it will not become effective until after a good rain. This year we had a 3 week dry spell in the application window. You can apply in liquid too. It will only stay effecting for about a month.