Johnson Grass is a stubborn and invasive weed that can quickly overtake gardens, lawns, and agricultural fields. Choosing the best herbicide to control Johnson Grass is essential for maintaining a weed-free environment. Below is a summary table featuring top Amazon herbicides proven effective for Johnson Grass management.
| Product | Brand | Type | Key Feature |
|---|---|---|---|
| Gordon’s Ornamec 170 Grass Herbicide, 32 Ounces | PBI / Gordon | Selective Post-Emergent | Targets annual grasses, safe for ornamentals |
| Monterey Grass Getter 8oz | Monterey | Selective Post-Emergent | Kills perennial and annual grasses including Johnson Grass |
| Hi-Yield (31134) Grass Killer Postemergence 8 oz | Hi-Yield | Selective Post-Emergent | Safe for vegetables and ornamentals; fast action |
| Compare-N-Save Glyphosate Concentrate 16-ounce | Compare-N-Save | Non-Selective Concentrate | Highly effective systemic glyphosate formula |
| ECO Garden PRO Organic Vinegar Weed Killer 1 Gallon | ECO GARDEN PRO PROFESSIONAL | Organic Non-Selective | Safe for pets and kids; fast-acting natural formula |
Gordon’s Ornamec 170 Grass Herbicide, 32 Ounces
Ornamec 170 is a selective post-emergent herbicide specifically designed for maintaining landscape beds and controlling annual grasses. It selectively targets grasses like panicums, goosegrass, crabgrass, foxtails, and sandbur while minimizing risks to ornamental plants. This product is ideal for those looking to manage Johnson Grass in areas with other desirable plants. Its formulation allows for effective grass control while preserving landscape aesthetics.
Monterey Grass Getter 8oz Selective Herbicide
This selective post-emergent herbicide is effective against a wide range of grassy weeds including hard-to-kill species such as Johnson Grass, crabgrass, bermudagrass, and foxtail. It works systemically to kill unwanted grassy vegetation down to the roots without harming nearby ornamental plants or vegetables. It is safe for over-the-top application on shrubs and ground covers but should not be used on lawn grasses.
Hi-Yield (31134) Grass Killer Postemergence Herbicide (8 oz)
The Hi-Yield Postemergence Grass Killer offers selective control of grass weeds in gardens, vegetable patches, trees, and ornamentals without damaging non-grass plants. It works quickly, stopping weed grass growth within 2 days of application, making it effective for Johnson Grass infestations. This herbicide suits areas where selective weed control around desirable vegetation is required.
Compare-N-Save Glyphosate Concentrate 16-ounce Bottle
This concentrated glyphosate formula contains 41% active ingredient and is a non-selective systemic herbicide that kills most types of weeds and grasses including Johnson Grass. It is rainproof within 2 hours and provides a ready-to-use spray solution upon dilution. Due to its broad-spectrum action, it should be used cautiously to avoid damage to surrounding plants.
ECO Garden PRO Organic Vinegar Weed Killer, 1 Gallon
For environmentally conscious users, this organic vinegar-based weed killer offers a pet- and kid-safe alternative to synthetic herbicides. With fast action reported within 24 hours, it is effective against Johnson Grass and other tough weeds on surfaces like driveways, sidewalks, and mulch beds. Its proprietary formula includes organic rock salt and biodegradable plant activators for enhanced weed control without harmful chemicals.
Buying Guide for Selecting Johnson Grass Herbicides
Choosing the right herbicide for Johnson Grass depends on several factors:
1. Selective vs. Non-Selective
Selective herbicides target specific grass species without harming surrounding plants, ideal for garden beds and ornamental areas. In contrast, non-selective herbicides kill all vegetation they contact, suitable for clearing large infested areas but require careful application to protect desirable plants.
2. Application Timing and Method
Post-emergent herbicides work best when Johnson Grass is actively growing. Some products can be sprayed directly over ornamental plants while others require spot treatment. Granular herbicides offer preventive action but are less effective on established grass.
3. Safety and Environmental Impact
Consider the safety for children, pets, and beneficial insects. Organic herbicides with natural ingredients provide safer options though effects might be slower or require repeated applications. Glyphosate-based products are highly effective but have restrictions on use in some areas.
4. Coverage Area and Concentration
Evaluate the size of your infestation and choose product volume accordingly. Concentrates allow for dilution and larger coverage, whereas ready-to-use sprays are convenient for smaller patches.
5. Long-Term Control and Prevention
For persistent Johnson Grass, combining post-emergent herbicides with preventative products or cultural practices like mulching can improve control success.
Understanding these factors will help you select the most efficient herbicide to manage and eliminate Johnson Grass effectively from your property.