grass killer concentrate

Pre-emergent concentrates typically prevent new weed growth for up to about three months. Some dual-action concentrates advertise protection for as long as 12 months while also killing existing weeds. Actual duration varies by product and formulation—check the product label for the specific prevention period for the concentrate you plan to use.

A common guideline on many product directions is roughly one gallon of mixed spray per 300 sq ft. Coverage can vary by product because dilution rates differ—always follow the label’s mixing instructions to determine the exact gallons-per-area for the concentrate you’re using.

Concentrates target common broadleaf and grassy weeds such as dandelion, crabgrass, poison ivy, clover, spotted spurge, nutsedge, kyllinga, plantain, chickweed and dollarweed.

Pre-emergent concentrates are labeled to prevent weed seeds from germinating and do not control established weeds. Other concentrates are formulated to kill existing weeds and grasses, often targeting roots for longer control.

Sulfentrazone and quinclorac are explicitly named in the descriptions. Other products refer generally to multiple or “proven” ingredients without listing them by name.

Descriptions commonly recommend applying when weeds are small and actively growing. Some products specify spring or fall timing, while others note use through the summer as weeds emerge—follow the product label for the best timing for that concentrate.