Ideal for use from spring through fall, Bayer Advanced Season Long Weed Control For Lawns uses a proprietary two-in-one formula for both post- and pre-emergent effectiveness. It will kill existing weeds immediately, and prevent new growth from emerging for up to six months. Best of all, this formula will not harm your lawn. Do not use on carpetgrass, improved varieties of St. Augustine grass (such as Floratam), Dichondra, or desirable clovers. Does not control crabgrass. Not for sale in NY. | BioAdvanced Season Long Weed Control For Lawns | Size 24 oz