Ortho® WeedClear™ Lawn Weed Killer Ready-to-Use1 (2024)

FAQs

How do you use Ortho WeedClear ready-to-use? ›

Works on a lot of weeds, but can't use it when it get above 80 degrees, it will kill your grass. Used this for the first time this year. It did a pretty good job on dandelions but not really much else but it does kill a pretty decent variety of weeds. was disappointed it did not kill crabgrass.

Please note that it takes a minimum of 3 weeks to for this product to completely kill weeds. Visible results can be seen after 24 hours; but this is not how long it takes to kill the weed, simply to see the results of the product working.

To use this concentrate, simply mix 24 fl. oz. with 1 gallon of water in a tank sprayer. Use on areas where weeds are not desired, including driveways, sidewalks, gravel areas, rock and desert landscapes, under decks, on parking areas, along fences and curbs, and in unplanted areas.

For the best results, apply when weeds are small and actively growing in the spring or fall, and when daytime temperatures are between 45 and 90 degrees. Following application, bare spots may be seeded after 4 weeks.

It is safe for pets and humans to reenter the space once the herbicide has thoroughly dried.

Weedkiller stays in the soil, or becomes part of it, for many years. Throughout the growing season of the plants, the weed killer is washed away with the water. However, as the plants grow and compete with one another, weed killer breaks down into smaller molecules.

Ortho Ground Clear is as good as Roundup in terms of killing weeds. However, it is known to be the more harmful of the two because it contains both glyphosate and imazapyr. These chemicals can be quite dangerous to the environment and the user who's in contact with it regularly.

It's rainproof 1 hour after applying it, and it kills over 200 weeds at their roots.

When should I put down Ortho weed killer? ›

For best results, apply in the spring and fall, when weeds are young and actively growing. To target large and smooth crabgrass, use in the spring before crabgrass is 4 inches tall or when it's first noticeable in the lawn.

Fertilizers and weed sprays are harsh on lawns during the summer dormant period, so it may be best to layoff treatments until that period is over. For those who haven't been fertilizing and/or using weed control, it's never too late.

Do not water right after applying a weed killer. Wait a minimum of two days before watering.

Yes, you can.

Simply connect the sprayer to the garden hose and then turn on the water. Walk to the farthest part in your yard and then work your way back. To spray, slide switch to “ON”. Then spray evenly only until the surface of the lawn is wet.

Apply when the winds are calm. Rainproof in 2 hours upon drying.

A: Need to at least give it 24 hours to dry real good to work. I would not advise spray same day then rain that night. Helpful? A: For best results apply Ortho GroundClear Year Long Vegetation Killer when weeds are actively growing when temperatures are between 65 to 85 degrees.

Answer: Most broadleaf herbicides should not be sprayed on newly seeded turfgrass until after the area has been mowed twice. You can start mowing a newly seeded area once the yard has grown to three inches tall, and you can mow it at 2 to 2.5 inches height of cut.

The reason is that most seeds need warmer temperatures to germinate, and snow halts the germination of seeds altogether. Grass seeds in snow will simply lie there until temperatures rise, so seeding earlier in the season will yield better results.

Kill weeds and any remaining poor-looking grass with a non-selective herbicide about 2 weeks before you want to seed your lawn. After everything is completely dead, rake the area to remove the debris.

Can dogs be poisoned by Roundup? ›

Is Roundup Toxic To Dogs? Roundup's primary ingredient, glyphosate, is generally considered harmful to dogs if ingested or with external contact when it's still wet (for short-term toxicity).

Dogs experience the same reactions to pesticide exposure as do humans. These include immediate symptoms such as skin rashes, nausea and vomiting, eye irritations, and respiratory problems.

This product, Ortho Essential Oils Home Defense is ideal for use indoors especially in and around the kitchen. It is safe to use around children and pets when used as directed.

In both the burndown and in-crop studies, the most effective timing was usually midday, followed by midnight. Coles says, “Since night spraying was usually more effective than dawn, night spraying could be a good option when daytime opportunities for spraying are limited.”

Using Bleach to Kill Weeds Permanently

Apply one cup of bleach, undiluted, to the afflicted area. Wait until the weeds turn brown before pulling them out of the ground. Run water around the area to flush the bleach, especially if you are trying to grow plants or grass in that area.

This is why most weed killers are designed to evaporate within 24 to 78 hours. This means that for the most part, it is safe to plant anything, edible or non-edible, in a place where you have sprayed weed killer after three days. If you want to be extra sure, you can wait a week or two before planting.

Organic Roundup alternatives include herbicidal soaps that use fatty acids to kill weeds and industrial vinegar, which contains much higher levels of acetic acid than what you have in your kitchen. Acid-based herbicides burn down some young weeds. Corn gluten meal can kill grass weeds and broadleaf weeds.

When equal amounts were given orally and compared, it took less acetic acid to kill rats in the laboratory test that it did glyphosate. The acetic acid in even household vinegar was MORE toxic than Roundup!

Dish soap is used as a surfactant, both when washing dishes and applying herbicide to plants. While it might effectively remove grease and food from plates, dish soap probably should not be the “go-to” surfactant for herbicides.

Research shows PPO herbicides more effective at midday. Summary: Some herbicides are more effective when applied at noon compared to early morning or late evening applications, new research indicates. Researchers say the results have long-term implications for weed management.

Should I water my lawn before spraying weed killer? ›

Pre-emergent absolutely must be watered-in to do it's job. Even during the times-of-year where it may seem odd to water your lawn – you're doing it for the pre-emergent herbicide, not for the grass. You can read more in our blog on why we treat at odd times of the year.

Weeds love to sprout after it rains, which is why waiting for dry conditions is ideal. Waiting for rain-free days also ensures that Mother Nature won't wash away any of the product before it goes to work on the weed.

Household vinegar has an acetic acid concentration of about 5 percent. Acetic acid is a desiccant, meaning that when sprayed on the surface of a plant, it draws moisture out of the leaves, killing the top growth. Most effective on small or new weeds, it kills the top easily enough.

The most effective homemade option is a mixture of white vinegar, salt, and liquid dish soap. Each of these ingredients has special properties that combine to kill weeds. Both the salt and the vinegar contain acetic acid, which serves to dry out and kill the plants.

Ground Keeper is a long term weed killer and forms a protective barrier in the soil which prevents most new weeds from emerging for up to 9 months after application.

A Farming Smarter study of night spraying of various herbicides in Alberta concluded that: The herbicides in pre-seed burndown and in-crop trials performed most effectively when applied in the day time (12-2 p.m.). Night time (12 p.m. – 1 a.m.) gave better results than the least effective dawn time (4-5 a.m.).

The ideal temperature for applying most post-emergence herbicides is between 65°F and 85°F; however, that window is not always practical with other fall practices. Herbicides can be applied at temperatures of 40°F to 60°F, but weeds may be killed slowly.

For the best results, gardeners should time the weed killer application to take place before weed seeds start to germinate, generally in the early spring. Gardeners often reapply the weed killer approximately eight weeks after the first spraying to help with exceptionally invasive weeds, such as crabgrass.

If you start too early in March, you might find yourself out spraying for weeds when the air temperature is 65 degrees but the soil temperature is still too cold for the weed killer to work just yet. You might consider waiting a few more weeks and let that soil temperature warm up a little more.

Fall (mid-September to early November) is the best time to control perennial broadleaf weeds in the lawn with broadleaf herbicides. In fall, perennial broadleaf weeds are transporting food (carbohydrates) from their foliage to their roots in preparation for winter.

Should I pull weeds after I spray them? ›

One of the questions we often get asked is - "do you have to pull up dead weeds after spraying them?" The short answer is yes, but it's important that you pull the dead weeds up in a very specific way to ensure that they don't come back to haunt you the following year...

Avoid spraying weeds if the wind has picked up ahead of a storm, or in any particularly breezy conditions. Wind can cause the herbicide to drift and cause damage to plants you don't plan on killing.

Glyphosate was first developed by the company Monsanto under their trademarked name for the chemical, RoundUp. Monsanto had patent ownership of the Glyphosate formula until the expired in 2003. Various companies now develop generic brands of RoundUp, such as Eraser from Control Solutions and Glyphosate 4 by Alligare.

For best control, herbicide should generally be applied in September or October, and current recommendations for systemic broadleaf herbicides are to withhold mowing at least 2 days before or after an application.

(3 Tbs) of product into 1 gallon of water to cover 500 sq. ft. When using a Tank Sprayer on Kentucky Bluegrass, Bahiagrass, Common Bermudagrass, Fescues, Perennial Ryegrass, and Zoysiagrass, mix 3.0 fl. oz.

Wait 3 days after last mowing the lawn. This will allow weeds to grow and have more leaf area to absorb the weed killer. Apply at 35gms per square metre, either by hand or with a spreader.

Weedkiller stays in the soil, or becomes part of it, for many years. Throughout the growing season of the plants, the weed killer is washed away with the water. However, as the plants grow and compete with one another, weed killer breaks down into smaller molecules.

The best time of year to use weed killer is Spring, followed by Fall. Spring is an effective time for catching weeds in their pre-growth season, in order to prevent them from sprouting. Fall is similarly effective because, ahead of the Winter, this is when weeds are most vulnerable.

Fall (mid-September to early November) is the best time to control perennial broadleaf weeds in the lawn with broadleaf herbicides. In fall, perennial broadleaf weeds are transporting food (carbohydrates) from their foliage to their roots in preparation for winter.

Ortho Ground Clear is not the same as Roundup. They are both great herbicides that are very effective in removing weeds. The main difference between the two brands is that Ortho Ground Clear contains an ingredient called imazapyr, which can be harmful if it isn't applied carefully and correctly.

What is the ratio of weedkiller to water? ›

Mix 1.5 ounces (3 tablespoons) of herbicide to 1 gallon of water to renovate an entire lawn, or to eradicate weeds and grasses that are easy to kill. For tougher jobs, such as vines or perennials weeds, mix 2.5 ounces (5 tablespoons) to 1 gallon of water.

For best control, herbicide should generally be applied in September or October, and current recommendations for systemic broadleaf herbicides are to withhold mowing at least 2 days before or after an application.

It is usually best to wait 24 hours before watering the grass following an application that contains weed control. Also make sure that within 7 days of the application the product has been watered into the soil either by rain or sprinkler to ensure the best results.

You usually don't want to mow your lawn within 24 hours before any such treatment. This is because if you mow right before an herbicide treatment, there isn't much leaf area left to absorb the weed control. If a broadleaf weed control doesn't come in contact with enough of the plant's foliage, it won't be effective.