What is Lawn Weed Killer?

Lawn weed killer, also known as herbicide, is a type of chemical or natural substance used to control or eliminate unwanted weeds in lawns and gardens. Weeds are invasive plants that compete with desirable plants for resources such as water, nutrients, and sunlight. They can quickly spread and take over a lawn if not properly managed. Lawn weed killers are designed to target and kill these unwanted plants, allowing the grass and other desirable plants to thrive.

Types of Lawn Weed Killers

There are several types of lawn weed killers available on the market, each with its own unique properties and modes of action. It’s important to choose the right type of weed killer based on the specific weed problem and the desired level of control. Here are some common types of lawn weed killers:

Selective Weed Killers

Selective weed killers are designed to target specific types of weeds while leaving the surrounding grass and plants unharmed. They contain herbicides that are only effective against certain types of weeds, allowing for precise weed control. Selective weed killers are commonly used in lawns where grass is the desired plant and broadleaf weeds, such as dandelions and clover, are the main problem.

Non-Selective Weed Killers

Non-selective weed killers, on the other hand, are designed to kill any plant they come into contact with. They are not specific to certain types of weeds and will kill both weeds and desirable plants alike. Non-selective weed killers are often used in areas where complete vegetation control is desired, such as driveways, sidewalks, and gravel paths.

Pre-Emergent Weed Killers

Pre-emergent weed killers are applied before weed seeds germinate and emerge from the soil. They create a barrier that prevents weed seeds from sprouting, effectively stopping weeds before they become a problem. Pre-emergent weed killers are commonly used in the spring and fall to prevent the growth of annual weeds, such as crabgrass and chickweed.

Post-Emergent Weed Killers

Post-emergent weed killers are applied after weeds have already emerged from the soil. They are designed to kill existing weeds and are often used for spot treatments or to control weeds in established lawns. Post-emergent weed killers can be selective or non-selective, depending on the specific product.

Systemic Weed Killers

Systemic weed killers are absorbed by the plant and transported throughout its tissues, including the roots. They are effective at killing the entire plant, including the roots, and are often used for perennial weeds that are difficult to control. Systemic weed killers provide long-lasting control and are typically applied to the foliage of the weed.

Contact Weed Killers

Contact weed killers, also known as foliar weed killers, are applied directly to the foliage of the weed. They work by coming into contact with the plant’s leaves and stems, causing damage and eventually killing the weed. Contact weed killers are often used for annual weeds and provide quick results.

Organic Weed Killers

Organic weed killers are made from natural ingredients and are considered a more environmentally friendly alternative to chemical herbicides. They often contain ingredients such as vinegar, citric acid, or essential oils, which can help control weeds without harming the environment or desirable plants. Organic weed killers are typically non-selective and may require multiple applications for effective control.

Application Methods

Lawn weed killers can be applied using various methods, depending on the specific product and the size of the area being treated. Some common application methods include:

Spray Application

Spray application is the most common method of applying lawn weed killers. The product is typically mixed with water and sprayed directly onto the weeds or the desired area. Sprayers can be handheld, backpack-mounted, or attached to a hose for larger areas.

Granular Application

Granular weed killers come in the form of small pellets or granules that are spread evenly over the lawn or garden. They are often applied using a spreader, which helps distribute the product evenly. Granular weed killers are convenient for larger areas and provide long-lasting control.

Spot Treatment

Spot treatment involves applying the weed killer directly to individual weeds or small patches of weeds. This method is useful for controlling isolated weed problems without affecting the surrounding plants. Spot treatment can be done using a sprayer or by carefully applying the product with a brush or sponge.


In conclusion, lawn weed killers are essential tools for maintaining a healthy and weed-free lawn. By understanding the different types of weed killers and their application methods, you can effectively control and eliminate unwanted weeds in your lawn or garden. Whether you choose a selective or non-selective weed killer, organic or chemical, it’s important to follow the instructions on the product label and take proper safety precautions. With the right lawn weed killer, you can enjoy a lush and beautiful lawn free from invasive weeds.