Johnson grass can be stubborn, spreading through roots and tubers and resisting simpler weed control methods. The right herbicide targets the weed at the root while minimizing damage to desirable grasses and ornamentals. Below you’ll find five widely available products designed to tackle Johnson grass and other common lawn and landscape weeds. This guide compares active ingredients, application ease, and when to expect visible results to help you choose a solution that fits your lawn or garden.
| Product | Brand | Key Benefit |
|---|---|---|
| Roundup Weed and Grass Killer₄ with Pump ‘N Go 2 Sprayer | Roundup | Kills weeds to the root with fast rainproof action |
| Compare-N-Save Glyphosate Concentrate 16 oz | Compare-N-Save | High glyphosate concentration for broad coverage |
| Spectracide 1 gal Ready-to-Use Grass and Weed Killer | Spectracide | Ready-to-use spray with ACCUSHOT for easy application |
| Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer | Roundup | Kills existing weeds and provides up to 4 months of prevention |
| Atticus Empero Nutsedge Killer | Atticus | Systemic action that targets tough nutsedge in lawns |
Note: Always follow label directions for safe use, application timing, and replanting intervals. For Johnson grass specifically, look for products that provide broad-spectrum control and root-driving activity, and consider the tolerance of your lawn grasses to the herbicide chosen.
Roundup Weed and Grass Killer₄ with Pump ‘N Go
Roundup Weed & Grass Killer₄ is a ready-to-use solution designed to kill broadleaf weeds and grasses down to the root. Its Pump ‘N Go sprayer provides convenient, precise application for sidewalks, driveways, and around beds. The product is rainproof in about 30 minutes and shows visible results within hours, helping with rapid suppression of Johnson grass and similar problem weeds. The label notes you can replant within 1 to 30 days after application, depending on plant tolerance and location.
Compare-N-Save Glyphosate Concentrate 16 oz
Compare-N-Save Glyphosate Concentrate 16 oz delivers a high concentration of glyphosate per volume, enabling users to mix a large quantity of ready-to-use spray from a small container. The formulation is rainproof within roughly two hours and can cover up to 10 gallons when mixed, making it versatile for both in-ground weed control and larger hardscape areas. This option is suitable for homeowners who want to customize their spray volume and address multiple Johnson grass patches efficiently.
Spectracide 1 gal Ready-to-Use Grass and Weed Killer
Spectracide’s 1-gallon Ready-to-Use Grass and Weed Killer is designed for fast results on concrete edges, driveways, and around landscape features. The ACCUSHOT Sprayer provides extended reach and consistent application with an extendable wand. Users can expect visible results in as fast as 3 hours, with the option to replant new ornamentals or lawn components the same weekend in treated areas. This product is particularly convenient for mixed-use spaces where rapid weed suppression is helpful.
Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer
This Roundup formulation combines immediate kill action with extended prevention for up to 4 months. It works fast—rainproof in about 30 minutes—and delivers results within 6 hours. It is suitable for treating hardscapes, cracks in driveways and sidewalks, fences, mulched beds, and around the bases of established plants. This dual-action option is useful for long-term Johnson grass management in spaces where weed seeds are persistent.
Atticus Empero Nutsedge Killer
Atticus Empero Nutsedge Killer targets tough nutsedge varieties, which can accompany Johnson grass in some lawn and landscape settings. With 75% halosulfuron-methyl as the active ingredient, Empero travels to the root system tubers for comprehensive control. It is described as being adaptable to nearly all types of established warm- or cool-season turf grasses, enabling application in diverse lawn scenarios without as much risk to desirable grasses when used as directed.
Buying Guide: Key Purchase Considerations
Choosing the right Johnson grass herbicide depends on several factors. First, assess your lawn type and the presence of desirable grasses near the treatment area. Non-selective herbicides like glyphosate will kill most vegetation they contact, so they’re best for hardscapes and weed patches away from ornamentals. Selective products or those labeled for turf-specific use can protect lawns but may require multiple applications for perennial grasses with deep rhizomes.
Active ingredient and efficacy matter: glyphosate provides broad-spectrum control, including Johnson grass, but may require follow-up treatments or higher-volume applications in dense patches. Nutsedge-specific products (such as halosulfuron-methyl-based formulas) work well if nutsedge coexists with Johnson grass. For hardscapes and walkways, consider products with quick knockdown and fast rainfastness to minimize runoff and re-emergence.
Application practicality is important: pump-spray and ready-to-use formats reduce setup time and simplify targeting. Look for sprayers with extended wands for hard-to-reach areas and spray patterns that minimize drift to nearby desirable plants. Check replanting intervals and whether the product allows immediate reseeding or new plantings after treatment, especially in garden beds and ornamental borders.
Weather and timing can influence results. Most products specify a cooling or non-heat stress period for best movement within the plant. Avoid applying during extreme heat or drought conditions, and be mindful of rainfall forecasts to ensure the spray has adequate contact time before rain.
Cost and coverage vary widely. Concentrates like glyphosate solutions can be economical when treating large areas, but require precise mixing and more handling. Ready-to-use formulas offer simplicity at a higher per-application cost. For large landscapes, a concentrate with clear coverage estimates can reduce total costs over time.
Finally, consider environmental impact and safety. Use protective gear as recommended, keep pets and children away from treated zones, and store products securely. When dealing with Johnson grass in mixed lawns, choose a product compatible with your grass type to minimize unintended damage and to maintain lawn health after weed control.