Rhiannon Hendricks
Citric acid is an effective natural weed killer that does not contain harmful synthetic chemicals. It is a non-selective herbicide, meaning it will kill any plant it comes into contact with. Citric acid is a common ingredient in some commercial organic herbicides, but it can also be used to make DIY weed killers at home. Citric acid can be derived from citrus fruits or bought as a powder, and it is often combined with vinegar, soap, or lemon juice to create an effective weed-killing solution. When applied on a sunny, hot day, with temperatures above 65°F to 70°F, citric acid can efficiently kill weeds. However, it is important to be cautious as the acid can affect nearby desirable plants.
| Characteristics | Values |
|---|---|
| Effectiveness | Kills weeds and other plants |
| Selectivity | Non-selective, will kill any plant it comes into contact with |
| Safety | Non-toxic, does not harm bees, safe for organic yards and gardens |
| Application method | Spray directly on leaves and flowers on a hot, sunny day with little wind |
| Active ingredients | Citric acid, acetic acid (vinegar), lemon juice, water |
| Mixture instructions | Combine with water in a spray bottle or pump sprayer according to manufacturer's instructions |
| Reapplication | May require a second application for plants with extensive root systems or woody stems |
| Results | May take up to six months for woody weeds, soil pH must be neutralized afterward |
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What You'll Learn
Citric acid is an organic herbicide
Citric acid is a non-selective herbicide, meaning it will kill any plant with which it comes into contact. It is important to note that it should not be used to kill weeds in lawns with established grass or near desired plants, as it will kill them as well. Citric acid works by stripping the protective coating off the leaves of the weeds, allowing the acidic ingredients to burn out the foliage.
To make a citric acid herbicide at home, combine lemon juice concentrate and white or cider vinegar in a spray bottle. Shake the bottle to mix the two liquids, then spray the solution directly on the leaves and flowers of weeds on a sunny day when the temperature is above 70 degrees Fahrenheit. You can also add a small amount of liquid dish soap to help the mixture stick to the leaves.
Citric acid can also be combined with vinegar and citrus oil to create a generic citrus oil and vinegar herbicide. This mixture should be sprayed on a warm, sunny day when the weed leaves are dry, and the herbicide solution should be applied generously so that the leaves are thoroughly wet.
While citric acid is a natural herbicide, it is important to use caution when using it. Like any herbicide, it can be harmful to people, beneficial insects, non-target plants, and wildlife that may be accidentally exposed to direct spray. It is recommended to wear eye protection and gloves and to avoid breathing in concentrated vapors when handling citric acid herbicides.
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It kills weeds without harmful synthetic chemicals
Citric acid is a natural product proven to kill weeds without the use of harmful synthetic chemicals. It is a non-selective herbicide, meaning it will kill any plant it comes into contact with. For this reason, it should not be used to kill weeds in lawns with established grass.
Citric acid is found in citrus fruits and can be purchased in powder form. It can be combined with vinegar, lemon juice, or lime to create an effective herbicide. One recipe for a vinegar herbicide is 20% acetic acid (liquid), 5% citric acid (powder), 2% commercial surfactant, and 73% pure water. This mixture can be applied directly to the leaves and flowers of weeds on a hot, sunny day when the temperature is above 70 degrees Fahrenheit. The surfactant helps the mixture stick to the leaves, and the addition of polysorbate-20 can further enhance its effectiveness by stripping away the protective wax coating on plant cells.
Another recipe for a vinegar-based herbicide includes 5 cups of white vinegar (5% acetic acid), 1 cup of bottled lemon juice (3-8% citric acid), and 4 tablespoons of dishwashing detergent. This mixture can be sprayed onto weeds, ensuring that the leaves and central growing point are thoroughly coated.
Citrus oil can also be used as a natural herbicide. A mixture of 1 quart of orange oil, 4 gallons of 12% vinegar (acetic acid), and 2.75 gallons of pure water can be applied per acre. Any citrus oil, such as d-limonene, cinnamon, or other essential oils, can be used.
It is important to note that vinegar is a strong acid that can burn the skin and eyes. When working with vinegar-based herbicides, it is recommended to wear rubber gloves and safety goggles and avoid inhaling the vapors.
While citric acid is a natural and effective way to kill weeds, it may take several months to see results, especially with woody weeds. Additionally, repeated use of vinegar-based herbicides can lower the soil pH, affecting the growth of other plants. To restore the soil pH, lime can be added at a rate of 5 pounds per 100 square feet, along with a layer of compost to restore microorganisms.
Other natural alternatives to synthetic herbicides include using sunflower seed hulls or black walnut hulls and wood chips as mulch to retard weed growth. However, it is important to test these natural herbicides on a small plot or with crop plants before widespread application, as they may inhibit the growth of flowers and crops.
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It can be mixed with vinegar, lemon juice, and water
Citric acid is a natural product that can be used to kill weeds. It is a non-selective herbicide, meaning it will kill any plant with which it comes into contact. Therefore, it is not suitable for use in lawns with established grass.
Citric acid can be sourced from citrus fruits such as lemons, limes, and oranges. Lemon juice, in particular, contains a high amount of citric acid and can be used as a natural herbicide. To make your own herbicidal citric acid solution, mix 4 ounces of lemon juice concentrate with 1 quart of white or cider vinegar in a 2-quart spray bottle. Shake the bottle to mix the two liquids, then spray the solution directly onto the leaves and flowers of weeds on a hot and dry day when the temperature is above 70 degrees Fahrenheit.
Alternatively, a vinegar-based solution can be used to kill weeds. Regular kitchen vinegar containing 5% acetic acid is not effective at controlling weeds. However, vinegar concentrates containing 20% acetic acid are effective herbicides. These can be applied directly to the plant or to the soil. To make your own vinegar-based herbicide, combine 5 cups of white vinegar (5% acetic acid) with 1 cup of bottled lemon juice (3-8% citric acid) and 4 tablespoons of dishwashing detergent (to help the herbicide stick to the leaves). Spray the solution onto weeds on a warm, sunny day when the weed leaves are dry.
It is important to note that vinegar and citrus-based herbicides pose certain risks to gardens and wildlife. They can have a significant impact on soil pH, which can be harmful to soil organisms and beneficial insects. Therefore, these products should not be used on septic fields, near streams or ponds, or on edible crops. Always wear protective gear, such as rubber gloves and safety goggles, when handling concentrated vinegar, as it is a hazardous chemical that can burn the skin and eyes.
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It should be sprayed on weeds on a hot, sunny day
Citric acid is an effective, natural herbicide that can be used to kill weeds. It is a non-selective herbicide, meaning it will kill any plant with which it comes into contact. Therefore, it should be sprayed directly onto the leaves and flowers of weeds, rather than onto lawns with established grass.
To make your own citric acid herbicide, you can combine lemon juice with vinegar in a spray bottle. For a 2-quart spray bottle, mix 4 ounces of lemon juice concentrate with 1 quart of white or cider vinegar. Alternatively, you can make a vinegar herbicide by mixing 5 cups of white vinegar with 1 cup of lemon juice and 4 tablespoons of dishwashing detergent, which helps the mixture stick to the leaves. For a stronger vinegar herbicide, you can use vinegar concentrate, which contains 20% acetic acid, rather than the 5% found in common white vinegar.
To ensure the herbicide is most effective, it should be sprayed on weeds on a hot, sunny day when the temperature is above 70 degrees Fahrenheit. This is because weeds are actively transpiring in hot, sunny weather, with open pores on their leaves, allowing the herbicide to work most efficiently. It is also important to ensure that it will not rain for several hours after application, so the herbicide has time to work.
If the weeds have an extensive root system or woody stems, a second application may be required after one week.
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It will kill any plant it comes into contact with
Citric acid is a natural product that can be used to kill weeds without the need for harmful synthetic chemicals. It is an effective herbicide that will kill any plant it comes into contact with.
Citric acid is a non-selective herbicide, meaning it will kill any plant, not just weeds. This is important to keep in mind when applying the herbicide, as desirable plants may be affected. To avoid this, it is recommended to apply the citric acid solution on a day with little wind.
Citric acid can be purchased or made into a DIY weed killer using household ingredients. One recipe calls for lemon juice, vinegar, and water to be combined in a spray bottle and applied directly to the leaves and flowers of weeds. The vinegar in the solution is the key ingredient that ruptures the cell walls of the plants, causing them to leak water and eventually die of thirst.
When using citric acid to kill weeds, it is important to follow the manufacturer's directions for mixing and application. The concentration of the solution and the method of application can vary depending on the specific product and the type of weed being targeted. For example, weeds with extensive root systems or woody stems may require a second application of the herbicide for complete effectiveness.
Citric acid is a safe and organic alternative to synthetic herbicides, making it a popular choice for homeowners who want to maintain an organic yard and garden. However, it is important to note that citric acid may not be effective against mature perennial weeds or perennial grasses, as these established plants are not affected by contact herbicides in the same way as younger plants.
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Frequently asked questions
Yes, citric acid is a natural product that can kill weeds without the use of harmful synthetic chemicals. It is a common ingredient in commercial organic herbicides.
You can make a citric acid weed killer solution by combining lemon juice, vinegar, and water in a spray bottle. You can also add dish soap to help the solution stick to the leaves. For a stronger solution, use vinegar with a higher acidity level.
Apply the citric acid solution directly to the leaves and flowers of weeds on a sunny, warm, and dry day when the temperature is above 65°F (ideally above 70°F). Avoid spraying on a windy day to prevent affecting other desirable plants. For weeds with extensive root systems or woody stems, a second application may be necessary after a week.
