Roundup Dual Action Weed & Grass Killer Concentrate — 4 Month Preventer, 1,600 sq ft Coverage

Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate kills current weeds to the root and creates an invisible barrier that prevents new weeds and grasses for up to four months.

This concentrated formula is designed for targeted hardscape and landscape use where both removal and short-term prevention are needed. Mix a measured dose into a tank sprayer and apply over the full area you want protected — not just the visible sprouts — to establish the soil barrier. The product produces visible plant decline rapidly and provides up to 4 months of residual control in treated areas, with coverage up to about 1,600 square feet per bottle when mixed as directed.

How quickly will I see weeds die after spraying?

Weeds and grasses typically begin to yellow and wilt within hours after application, with clearer results over the first few days and complete die-off usually within one to two weeks. Speed depends on weather, temperature, and the size of the weeds at treatment.

• Visible yellowing often occurs within 6–24 hours in warm, sunny conditions.
• Smaller annual weeds die faster; larger perennials may take longer to brown out.
• Best activity when applied above 60°F on actively growing plants.

Can I use it near desirable plants, and when can I replant?

Roundup Dual Action is for spot applications where you intend to eliminate weeds and temporarily prevent regrowth. Avoid spraying foliage of desirable plants; the product can harm or kill them. After treatment, wait four months before planting ornamentals, trees, shrubs, sod, or seed in treated soil.

• Do not spray directly on desirable plants or their root zones.
• Replanting is safe four months after application per label directions.
• Apply to gravel, cracks, and mulched beds while protecting nearby plantings.

How do I mix and apply the concentrate for best results?

Add 6 fluid ounces of Roundup Dual Action Concentrate per gallon of water in a tank sprayer, mix thoroughly, and apply evenly across the entire area you want to prevent weeds — not just on visible weeds. For residual prevention, treat the full surface so the active ingredients form the barrier in the soil.

• Measure 6 fl. oz. concentrate per gallon of spray water for labeled coverage.
• Spray uniformly over the whole target area, including spaces between plants or paving joints.
• Rain or irrigation 30 minutes after application will not remove effectiveness.

Where is this product most effective around my property?

This formula is suited to areas where you want controlled elimination and temporary prevention, such as sidewalks, driveways, patios, gravel paths, and fence lines. It also works in mulched beds or around the bases of well-established plants when used carefully to avoid contact with desirable foliage.

• Use on cracks and crevices in hardscapes to stop weeds at the source.
• Apply along fence lines, gravel areas, and between pavers.
• Safe for spot use near established shrubs if spray avoids their foliage and root flare.

Who is this product for: Homeowners, property managers, and maintenance crews who need a single concentrated solution to both remove established weeds and provide several months of prevention in non-crop areas. It suits anyone tackling weeds in driveways, patios, gravel beds, and other hardscape or landscape spots where replanting won’t occur for at least four months. Follow label instructions for safe, effective mixing and application and keep children and pets off treated areas until dry.