ferti-lome Weed-Out Lawn Weed Killer features TRIMEC to eliminate dandelion, chickweed, clover, henbit, poison ivy, and many other hard-to-control broadleaf lawn weeds. Weed-Out Lawn Weed Killer is formulated for use in northern and southern grasses such as bermuda, fescue, and bluegrass. Best used at the start of the growing season, when temperatures are between 65 and 85 degrees. Concentrated 16 oz. bottle. Always read and follow label directions.