Will Baking Soda Kill Grass? Is It an Effective Herbicide Alternative?

Baking soda, or sodium bicarbonate, is a common household item with a variety of uses, including as a DIY herbicide. Known for its ability to dehydrate and kill plants by drawing moisture from them, baking soda is considered a non-selective herbicide, meaning it targets all types of weeds and grass alike.

Its effectiveness extends to creating fungicides and insecticides for combating plant diseases and pests. Additionally, it can neutralize dog urine on grass and alter soil pH levels, sometimes necessitating a flush with water after application.

Various grass types, including Bermuda, St. Augustine, crabgrass, torpedo grass, and Zoysia, show differing levels of resilience to baking soda, with some being more susceptible than others.

Key Takeaways

  • Baking soda is sodium bicarbonate, which is toxic to plants. This means it can be efficient for all plant species if you use the right amount.
  • You can use it to get rid of the weeds and keep your garden in perfect condition.
  • It represents a much safer alternative when compared to common herbicides.

Can We Use It As a Replacement for Herbicides?

Sodium bicarbonate, widely recognized in households, emerges as a natural alternative to chemical herbicides. The substance’s efficacy in managing unwanted vegetation has sparked interest among gardeners and homeowners seeking eco-friendly solutions. However, the question of its viability as a standalone herbicidal replacement demands careful consideration of its mechanisms, benefits, and limitations.

Mechanisms of Action

Sodium bicarbonate operates by extracting moisture from plants, leading to dehydration and eventual death. Its non-selective nature means it indiscriminately targets all plant types, from grasses to broadleaf weeds.

The compound also influences soil pH levels, which can affect the nutrient availability for plants. Such characteristics underscore its potential in weed management but also hint at the need for cautious application to avoid harming desirable vegetation.

Also, check out our list of plants that starts with letter L.

Advantages of Sodium Bicarbonate as a Herbicide

Natural herbicide alternatives

  • Environmental Impact: One of the most compelling reasons to consider sodium bicarbonate as a herbicide is its minimal environmental footprint. Unlike synthetic chemicals that can leach into waterways and disrupt ecosystems, sodium bicarbonate poses less risk to non-target organisms and groundwater.
  • Safety: For households with pets and children, safety remains paramount. Sodium bicarbonate, being a common kitchen ingredient, is safer for direct contact compared to conventional herbicides that may contain toxic substances.
  • Cost-Effectiveness: Economically, utilizing sodium bicarbonate can be more advantageous due to its affordability and availability. This aspect makes it an attractive option for large-scale or frequent applications.

Are There Any Limitations?

Despite its benefits, sodium bicarbonate is not without its drawbacks. The application requires precision to avoid damage to desirable plants, given its non-selective nature. Certain grass and weed species exhibit varying degrees of resistance, which may necessitate multiple applications or higher concentrations, potentially leading to soil pH imbalance.

Restoring soil health after such treatments could require additional efforts, such as flushing the soil with water or applying amendments to rebalance pH levels.

Practical Application

When considering sodium bicarbonate as a herbicidal alternative, it’s crucial to adopt a targeted approach. Direct application to the leaves of unwanted plants can yield effective results, particularly for annual weeds and young, tender growth.

Creating a solution with water and a surfactant, such as oil, can improve adherence to plant surfaces and enhance effectiveness. However, immediate action to dilute any accidental spillage on lawns or desirable plants is essential to mitigate damage.

How to Use it Properly?

Grass-killing methods

Applying sodium bicarbonate effectively as a herbicide demands attention to detail and an understanding of the specific conditions under which it is most effective.

Targeted Application

  • Spot Treatment: Focus on direct application to the foliage of unwanted weeds and grasses. Use a sprinkle or a handheld spray bottle for precise control, ensuring the powder or solution makes contact with the target plants only. This method reduces the risk to surrounding vegetation.
  • Solution Preparation: Mix one part sodium bicarbonate with two parts water, adding a few drops of liquid soap or oil to enhance sticking to plant leaves. This mixture improves the substance’s adherence to weed surfaces, increasing its herbicidal action.

Timing and Conditions

  • Apply in Dry Weather: For maximum effectiveness, apply during dry, sunny conditions. Moisture dilutes the solution and reduces its potency, while sunlight accelerates the dehydration process of treated plants.
  • Early Weed Growth: Target weeds when they are young and actively growing. Early intervention prevents the establishment of deep roots, making the treatment more effective.

Soil pH Management

Baking soda as weed control

  • Monitor Soil pH: Since sodium bicarbonate can alter soil pH, it’s crucial to monitor these changes, especially in areas treated repeatedly. Use a soil pH tester before and after application to ensure the soil environment remains conducive to desired plant growth.
  • Adjustment After Use: If necessary, adjust the soil pH back to its optimal range for your garden plants. This may involve adding elemental sulfur or organic matter to lower the pH or lime to raise it if the sodium bicarbonate has made the soil too alkaline.

Protection of Desirable Plants

  • Shielding: Physically shield desirable plants with cardboard or plastic covers during application to avoid accidental exposure to sodium bicarbonate.
  • Immediate Dilution: In case of accidental spillage or drift onto desirable plants or lawns, immediately water the area thoroughly. This dilution helps mitigate the potential phytotoxic effects on non-target plants.

Effects on Different Grass Types

Baking soda lawn treatment

Understanding the impact of sodium bicarbonate on various grass types is essential for gardeners and landscapers aiming to maintain healthy lawns while controlling weeds. The substance’s non-selective nature means it can affect different grass species in distinct ways.

Bermuda Grass

Bermuda grass exhibits a notable tolerance to sodium bicarbonate treatment. This resilience stems from its robust root system and rapid growth rate, enabling it to recover from superficial damage. However, excessive application can still impair growth, leading to thinning and reduced vigor over time.

St. Augustine Grass

St. Augustine grass, known for its dense cover and shade tolerance, shows a marked vulnerability to sodium bicarbonate. Its less aggressive growth compared to Bermuda grass makes recovery from treatment more challenging. Care should be taken to avoid application on or near St. Augustine lawns to prevent unintended damage.


Non toxic weed control

As an annual weed, crabgrass is highly susceptible to sodium bicarbonate. Its shallow root system and rapid lifecycle make it less capable of withstanding the desiccating effects, leading to effective control when treated directly. This sensitivity makes sodium bicarbonate a useful tool for managing crabgrass invasions in lawns.

Removing this weed is very important if you want to keep your other plants healthy, it can be especially invasive for popular garden flowers like roses, lilies, and lavender.

Torpedo Grass

Torpedo grass, with its aggressive growth and water-seeking roots, is difficult to control but can be weakened by sodium bicarbonate. Although it may require multiple applications, the treatment can disrupt its growth patterns, especially in water-constrained environments. Persistent application can reduce its spread and impact on lawns.

Zoysia Grass

Zoysia grass, prized for its tolerance to drought and heat, also exhibits vulnerability to sodium bicarbonate. Its slow growth rate means recovery from treatment can take longer, risking damage to the lawn’s aesthetic and health. Users should exercise caution, applying sodium bicarbonate only to targeted weeds within or around Zoysia lawns.


What bugs hate baking soda?

Baking soda can repel or kill several common pests, such as centipedes, hornworms, mice, rats, and cabbage worms. However, it may not be effective against bed bugs, which have a protective coating on their shells.

Will vinegar kill grass?

Vinegar can kill grass, but it depends on the concentration and application method. Applying undiluted vinegar directly to the grass can be extremely harmful, and it will likely kill off not only the weeds but also the surrounding grass and other plants.

Can I put baking soda directly on soil?

Baking soda can be used to adjust the pH level of the soil, enhance the nutrient availability, manage the soil salinity, and control fungal diseases. However, baking soda should not be used on delicate or porous plastic surfaces, as it may cause damage.

Does baking soda damage plastic?

Baking soda is an abrasive cleaner, so there is a chance that it will scratch or damage the plastic. It is recommended to use a sponge to gently scrub the surface with baking soda and a small amount of water. After cleaning, make sure to rinse the area thoroughly and never apply too much pressure.

The Bottom Line

Sodium bicarbonate stands as a versatile, eco-friendly alternative for weed management in gardens and lawns, offering a safer option for both the environment and household use. Its application requires careful consideration of timing, grass type, and soil health to ensure effective weed control without harming desired vegetation.

By integrating this common household item into a broader lawn care strategy, gardeners can achieve a balance between maintaining lush, healthy lawns and managing unwanted plant growth.