6 Best Weed Killer For Large Areas 2020 Ultimate Guide

Best Weed Killer For Large Areas. Weeds will damage your land if you allow them to thrive and get out of control. Weeds can keep your crop yield down up to 35% per year, according to a study.

If you have a large area and you want to keep your land from weeds, you must find the best weed killer for a large area. You do not have to panic because there are many weed killer products on the market.

But it might be tricky finding an effective herbicide or weed killer that can cover large areas. There are factors that need to be considered if you want to purchase a weed killer that’s ideal for your land.

With these weed killers, you can deal with the problem.

List of the best weed killer for large area

1. Quali-Pro Prodiamine 65 WDG (Generic Barricade 65 WDG)

This Quali-Pro Prodiamine is a pre-emergent herbicide work best for pre-emergent broadleaf weeds and as grass killer. It works to prevent weeds from growing, but the product cannot be used on an overgrowth weed.

To apply the herbicide, the area must be prepared and cleared before any application. This weed killer product can be used during the fall and spring.

You must mix the powder form herbicide with water and use a sprayer. The active ingredient is 65% Prodiamine. It is recommended to apply when ground temperatures are between 40 to 45 degrees.

It is still effective once the ground reaches around 55 degrees, which is the ideal temperature for crabgrass seeds and other weeds.

This reliable herbicide will stop the roots of weeds from progressing once other seeds or the crabgrass start germinating. The plant will be killed before breaking through the soil.

You can use it for large areas that have already been prepared for application.

2. Roundup QuikPro

The QuikPro Roundup is an indiscriminate herbicide to kill any weed plant that it comes across. It consists of 73.3% glyphosate that prevents the plant’s capacity to absorb micronutrients and macronutrients from the soil.

The herbicide product does not disturb or damage the quality of the soil for your cultivated plant. When you are finished with the treatment, you can reseed the area.

To start the application, you must mix the granular form herbicide with water. The instruction label recommends mixing 1.5 ounces with one gallon of water.

You can also use two ounces per gallon of water for excellent results. One bottle can produce more than 72 gallons of herbicide solution. This herbicide product is a fast-acting weed killer with added 9.3% of diquat dibromide for its efficiency and speed.

Both diquat dibromide and glyphosate are a combination that is effective in getting rid of the root system and the top of the weed. Please be advised to wear protective gear when applying the herbicide.

This herbicide is not safe around humans or animals, so you need to make them far away from the areas. Start applying the weed killer on grasses and plants that have been cut down around two inches for the leaves.

The purpose of this practice is to give space for the weeds to absorb the chemical. If you want a quick kill of weed in large areas, this QuikPro is the best choice.

3. ROOTX – The Root Intrusion Solution

There are specific weeds that thrive and grow in sewer pipes. Sewer pipes are an ideal place and environment for them to live.

This Rootx herbicide is designed to kill those weeds that have crawled into sewage lines and pipes. It is well regarded as long as in proper usage.

It comes in a four-pound container (two different compartments), you need to mix and scoop out half of the contents from every compartment. After that, mix it in a different container, and fill them up in a separate bucket with five gallons of water.

Pour this mixture to the toilet and flush it. Start pouring the RootX powder mixture into the center of the bowl right away. Pour a bucket of water down right after.

There will be residue all over the inside of the sewer line that constrains the growth of roots as well as new weeds.

This product might be the most effective weed killer for large maintenance of pipes and sewage lines.

4. Tenacity Turf Herbicide

This Tenacity Turf weed killer has an active ingredient of 40% mesotrione that can be used to stop the growth of weeds and kill them. It works by stopping one compound that is very crucial in photosynthesis.

You do not need to purchase separate herbicide because it can be used for pre-emergent and post-emergent herbicide. Keep in mind that you will have to do several treatments and many weeks to get down to the weed problem.

According to verified purchasers, it would have results after three applications when applied every fifteen days. You can add a surfactant such as liquid dishwashing soap to keep the chemical in the soil.

Use a dethatching rake to eliminate any bentgrass to make sue that the chemical can reach the weed and get rid of any dead stolons. If you purchase this 8-ounce bottle herbicide, you can get about sixty gallons of herbicide. It is a good investment for large areas of treatment.

The Tenacity Turf herbicide product can be used for five to eight years as long as you store it in a dry and cool location.

5. Roundup Concentrate Max Control 365 Vegetation Killer

You can apply this weed killer by RoundUp on fence lines, foundations, walkways, patios, and driveways. It is a detailed weed control that comes with a wand.

You can spray this weed killer close to the cultivated plants like flowers and use it for large areas. It is primarily to eliminate weeds creeping up from underneath cement, concrete and substantial swathes of land.

You might have to wait until weeds stay green for about five to seven days before they die. After seven days, the soil is free from weeds for many months.

One 32-ounce Roundup Concentrate bottle can create 5.34 gallons of solution. Six ounces are needed for one gallon of water.

6. Roundup Weed and Grass Killer Super Concentrate

The Super Concentrate Roundup herbicide product is the most economical treatment for a post-emergent and pre-emergent herbicide. Though it is advertised as a post-emergent herbicide, you can apply this product as a pre-emergent herbicide.

The primary ingredient contains isopropylamine salt and 50% glyphosate. The formula can constrain the growth of weeds by stopping the progress of a specific plant enzyme.

Do not apply this weed killer near any vegetation or any flowers. The product should be applied while wearing protective gear because it might harm humans, especially the skin. It is not safe for animals, too, so you better keep them away when applying the herbicide.

You can expect a weed-free in large areas for 30 days before a reapplication is required. You can start applying by mixing 1.5 ounces of weed killer in one gallon of water.

The weed killer will penetrate the leaves in 30 minutes, and it is waterproof. Any rainfall will not wash away the application.

You can expect weeds to start wilting in two to four days. Wait for another 14 days to see the weeds to die.

Factors to consider when purchasing weed killer for large area

1. Safe for environment

You have to find out about the ingredients used by a weed killer when treating a large area near livestock or neighborhoods. There may be lingering effects that the herbicide formula can have on the large area.

It would be best if you kept in mind that there are weed killers that contain toxic chemicals that pose a health hazard to disturb the immune systems of humans.

Humans may not get the effects immediately, but it can provide any form of illness under prolonged exposure. The safety of the environment, animals, and humans must come first.

2. The reason for treating the large area

You might have to select the right herbicide or weed killer to treat a large area, whether in the large area for a construction site or golf course maintenance. Some large areas suffer from heavy foot traffic and require a herbicide that can eliminate weeds without endangering humans nearby.

3. The weather

Weather can affect the outcome of the herbicide application. Herbicides that have just been applied might be washed off and deactivated by rain.

These herbicides which come in either liquid form or granular form may be activated by the heat.

So, it is very crucial to apply at the right season or weather for better results.

4. Treatment or killing or prevention

A post-emergent herbicide is applied to get rid of a weed killer that has been mature or established while pre-emergent herbicide is applied to prevent an area or large area from being free of weeds.

It would be best if you planned whether to prepare the land to prevent the growth of weeds or to kill weeds that exist. The herbicide you are about to purchase can work both way or just one way. It is best to look through the options that best suit your needs.

5. The location

Weeds can live in a different location. Some grow and creep in a hard area. Some weeds grow in grassy areas.

It would be best if you considered purchasing a weed killer that can target the root of the problem while retaining certain areas untouched.

Most weed killers are non-selective, killing everything at the point of contact. You must make sure that the large area for treatment has been separated. The sprayer can be a significant factor in keeping other vegetation or cultivated plants or flowers safe.

When is the best time to apply weed killer for large area

Some weed killers can provide the best result when applied at specific times of the day. Other weed killers do not need specific timing to apply.

Post-emergent herbicides are non-systemic or systemic that kill existing weeds. Systemic weed killers move through plants to their roots, the active growing stage. One of the known ingredients is Glyphosate.

You can apply non-systemic herbicides any time of day and will damage plant tissues.

Pre-emergent herbicides can be applied during any time of the day and are also effective. These herbicides build a chemical barrier in the soil that stops weeds from appearing.

When you apply systemic herbicides at the growing stage during the day increases its effectiveness. Weed growth slows down or speeds up over the course of a day. It all depends on temperature, climate, and light level.

1. Cold climate

To have the best result during cold climate, apply systemic herbicides in the late morning, in midday, and the afternoon. Weed growth speeds up at sunrise and slows down at dusk.

Avoid heavy early morning dew because it can run off herbicide. Wait until the dew is evaporated.

2. Hot climate

During a hot climate or summer months, apply systemic herbicide in the early morning and late afternoon. You can apply this at the U.S. Department of Agriculture plant hardiness zone 9 and higher. Avoid applying herbicides in midday or early afternoon.

Midday heat in the summer causes weed growth to slow down, and the weed killers dry out fast on the leaves. This manner can reduce the number of herbicide weeds absorb.

In winter, in warmer climates region, weeds occasionally continue to grow. Apply systemic herbicides in the middle of the day when the temperatures are warmest.

3. Broadleaf weeds

Systemic herbicides for broadleaf weeds will provide the best result in specific temperature ranges. Herbicides for broadleaf weeds eliminate many lawn weeds, and it will not harm grass.

At lower temperatures, these types of herbicides may not be active. However, when temperatures are too high, they can harm and damage turfgrass.

Wait until the daytime temperature is within the proper range. Apply during temperatures between 50 and 85 degrees Fahrenheit. In cold climates in fall or spring, apply at the warmest part of the day. In warmer climates in summer, do not apply during the midday heat. Apply them in the morning or the late afternoon.

Henry Kaswandi, SS, M.Kom.

I had been doing gardening for the last 18 years. I enjoy writing reviews of many products and about gardening to give better experiences and accurate information.