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The Daily Insight

Will atrazine kill flowers

Author

Emma Valentine

Published Mar 28, 2026

Most herbicides have some form of negative effect on plants, since their sole purpose is to kill unwanted vegetation that invades your property. Atrazine will kill flowers and pose a health risk if not used properly.

What plants does atrazine kill?

Atrazine is effective against several common broadleaf weeds, such as Chickweed, Clover, Henbit, Pigweed, Ragweed, Doveweed, Oxalis, Betony, Gripeweed, and Morning Glory. Most pest grasses are also killed by Atrazine. This includes Foxtails, Annual Bluegrass, invasive Bermuda, Quackgrass, and Wire Grass.

Will atrazine kill lilies?

Atrazine herbicide, which is used on certain lawn grasses to kill weeds, may eliminate problem lily of the Nile plants.

What does atrazine do to plants?

Atrazine kills plants by disrupting photosynthesis. … Atrazine selectively kills non-desirable plants (weeds) that compete for water and nutrients with desirable plants (crops, turf- grass). Therefore, it is a useful tool for both agricultural and urban sites.

Will atrazine kill shrubs?

Answer: Hi-Yield Atrazine Weed Killer could damage or kill trees and shrubs, including all the ones listed. It should not be used over rooting area of trees, ornamentals, vegetables or other desirable plants other than indicated established turfgrasses.

Does Atrazine kill lawn grass?

Function. Atrazine will kill unwanted annual grasses and broadleaf weeds. The herbicide needs rainfall for it to be effective, so do not apply it during a drought.

Does Atrazine kill pigweed?

For example, pigweed still can be controlled using corn herbicides such as atrazine, which farmers have used for 40 years. “Almost every acre of planted corn is treated with atrazine,” says Patterson, adding that a couple of other corn-related herbicides are also still effective in treating resistant pigweed.

What types of plants is atrazine used for?

Atrazine is an herbicide widely used for control of broadleaf and grassy weeds. It is sprayed on row crops such as corn, sorghum and sugarcane, and in some areas is used on residential lawns. It has also been used on highway and railroad rights-of-way.

How long does atrazine stay in the soil?

Atrazine does not bind well to soil and can easily move in it. It has an average half-life in soil of around 60-75 days.

How long does it take for atrazine to work?

How long it takes to see results from an application of Atrazine can vary somewhat, depending on what type of weeds you are targeting. Typically, Atrazine is a very slow-acting herbicide, and it can take up to 4 to 6 weeks after application to see desired results and death of the target weed.

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Will atrazine kill dandelions?

Atrazine herbicide is used in crops such as corn and sugarcane. … It also has lawn care uses, like for golf courses and residential lawns as a weed killer. It is great for dandelions and crab grass without killing your grass.

When should I apply atrazine?

Hi-Yield Atrazine Weed Killer can be applied early in the morning before temperatures reach 90 degrees if it’s expected to get this hot on the day of application. You just do not want to apply during the time of high temperature because your desirable turfgrass is under more stress in high heat.

Does Atrazine kill chickweed?

It is used to safely control annual broadleaf and grass weeds in cornfields, sugarcane fields, and turfs. The active ingredient, Atrazine will kill weeds as seeds or kill emerged weeds through the root system. Atrazine 4L Herbicide will control for barnyard grass, chickweed, henbit, and more.

What kills weeds but not flowers?

A mixture of one cup of salt dissolved in 2 cups of hot water will also work. Some gardeners spray with full-strength apple cider or white vinegar, but rain dilutes their effectiveness. Be careful not to get any of these on your grass or the desirable plants in your borders and beds.

Will atrazine hurt trees?

The active ingredient in many, if not most, weed and feed products is Atrazine. It does the job well of killing weeds, but because it can kill weeds, it can kill other living plants as well, including trees. The tiny feeder roots of the trees pick up the chemical, which burns the roots, causing stress to the tree.

Does Atrazine kill annual ryegrass?

Avoid using PSII herbicides — atrazine and metribuzin — in mixtures with glyphosate as they can cause antagonism and poor control of annual ryegrass.

Does Atrazine kill Johnson grass?

Yes, you can use Hi-Yield Atrazine Weed Killer for all the weeds you listed except for Johnsongrass. Atrazine will suppress crabgrass, but it may not competely control it. … You could use Certainty Herbicide to help control johnsongrass in Centipede turf.

What weeds will atrazine kill?

Atrazine, when combined with emulsifiable agricultural oil and water is effective against post-emergent weeds. These include morning glory, cocklebur, jimsonweed, lamb’s quarters, pigweed, ragweed, various mustard weeds, buckwheat, purslane, amaranth, Spanish needle, velvetleaf and most grasses.

Does Atrazine kill crab grass?

Atrazine will suppress crabgrass, but it may not competely control it. The best time to treat for post-emergent control is when the weeds are young and actively growing, usually when temperatures are between about 55 and 85 degrees.

Is atrazine safe for St Augustine?

Yes, Southern Ag Atrazine Weed Killer for St. Augustine Grasses is able to be used on St. Augustine Floratam lawns. It is both a pre-emergent and post emergent and is best applied when weeds are small or have not yet emerged.

Can you use atrazine on fescue?

Answer: Hi-Yield Atrazine Weed Killer cannot safely be applied to Fescue lawns. You can use Corral 2.68G which will control POA in Fescue.

Will atrazine kill lespedeza?

Atrazine may be used to control lespedeza in centipedegrass and St. Augustinegrass only. Atrazine is a post-emergence broadleaf weed killer that also controls several common grassy weeds and has some pre-emergence activity.

How do I use atrazine on my lawn?

Spray the atrazine solution onto the foliage of the weeds. Avoid spraying on windy days so no drifting mist from the spray accidentally falls upon nearby non-weedy, ornamental or crop plants. Do not overlap your spraying, meaning do not spray over foliage that has already been coated with the atrazine solution.

How long does atrazine need to be sprayed before rain?

How long does atrazine need to be sprayed before a rainstorm? You need to apply atrazine at least 1 hour before it rains in your area for the best application and absorption.

How much rain do you need to activate atrazine?

Single Active Ingredient ProductsPrecipitation Required for ActivationAcetochlor (Harness/Degree)0.25 to 0.75 inches within 7 days after applicationPyroxasulfone (Zidua)0.5 inches before weed emergenceAtrazineNothing about precipitation amounts mentioned

Why is atrazine banned?

Atrazine is a common agricultural herbicide with endocrine disruptor activity. … Although the U.S. Environmental Protection Agency (EPA) approved its continued use in October 2003, that same month the European Union (EU) announced a ban of atrazine because of ubiquitous and unpreventable water contamination.

Does Roundup contain atrazine?

“Atrazine is a hundred times worse than glyphosate, the active ingredient in Roundup, because it’s an endocrine disruptor,” said Nathan Donley, a scientist at the Center for Biological Diversity, which has called for a complete ban of the chemical. … Atrazine has been mired in controversy since Dr.

What are the dangers of atrazine?

Atrazine has a lot of adverse effect on health such as tumors, breast, ovarian, and uterine cancers as well as leukemia and lymphoma. It is an endocrine disrupting chemical interrupting regular hormone function and causing birth defects, reproductive tumors, and weight loss in amphibians as well as humans.

When can I mow after atrazine?

Answer: You could mow your grass 2 days before applying Hi-Yield Atrazine Weed Killer and can mow at least 3-4 days after application.

Can you mix atrazine and 24d?

Answer: These products may be mixed together following the instructions on each product label. We do recommend a compatibility test if you have not done so previously.

Does atrazine have a shelf life?

Hi-Yield Atrazine Weed Killer has a shelf life of 3-5 years, if stored in a cool, dry place.