7 Best Weed Killers for Flower Beds 2020

If you’re wondering how to get rid of the weeds in your flower bed or lawns, you’re not alone! Best Weed Killers for Flower Beds

You can get about it the ordinary way by hand plucking the weeds but this is laborious and not a permanent solution.

The weeds will just grow right back if not removed by the root. We believe that the best way to deal with it is by applying a weed killer or a herbicide.

Pre-emergent weed killers can be applied before planting the flower seeds but there are post-emergent killers too if you spotted the weeds late.

Reviews: 7 Best Weed Killers for Flower Beds 2020

1. Ortho GroundClear Vegetation Killer Concentrate – My Top Pick

Ortho Ground Clear is a selective weed killer and works on post-emergent weeds in your flower beds. So your plants and flowers will not be affected by using this product.

Best Weed Killers for Flower Beds Check Price on Amazon

The Ortho Killer works on stubborn weeds like Bermuda grass, Oxalis, Chickweed, Clover, St. Augustine, Bluegrass, Centipede grass, among others.

Its advanced formula offered works fast in most environments and starts showing results within 6 hours. Ortho claims to prevent weed growth up to 1 year of application which is a lot in comparison to competitors. This is because it works by destroying the roots of the weeds.

Ortho Clear Vegetation Killer eases the process if you have experimented with many products. It consists of Glyphosate and Imazapyr that work together to tackle all kinds of weeds. The product gets rainproof in an hour which is very quick in comparison to others on the list.

There are 3 convenient methods of application- ready-to-use wand concentrates or a ready-to-use sprinkler cap. You can use it to kill most annoying weeds on your flower beds, sidewalks, fences, or patios. It comes in a pre-mixed formula which is great if you are a beginner to the DIY.


  • Affordable
  • Is non-selective so works on a wide variety of weeds
  • Works on flower beds and also vegetable or fruit gardens without damaging edibles
  • Inhibits the growth of weeds for about a year after use


  • Best results when used on dry soil

Related: Best Powdery Mildew Fungicide

2. Compare-N-Save Concentrate Grass and Weed Killer – Runner-Up

The Compare-N-Save Weed killer is a powerful concentrated grass and weed killer that is composed of 41% glyphosate.

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It works on all annual and perennial weeds and most other unwanted plants. Apply the product by mixing it with water and spraying directly on to actively growing weeds.

The Compare-N-Save is a non-selective herbicide so make sure it doesn’t reach the leaves, stems or roots of any plants that you don’t want to kill.

If you need season-long residual weed control, consider using a product like RM 43. The Compare-N-Save is cost-effective as it can be used on large areas of 25,000 square and more. The Compare-N-Save can be used around landscaping, passageways, and driveways, fences and around buildings.

You may also use this product for restoring your lawn or renovation projects as well as for landscaping or preparing your plot. It is safe to plant new seed after this product has been applied as it only kills actively growing weeds.

The magic lies in the 41% concentration glyphosate that works on the entire weed plant. You will need to make a mix of 1.5 oz. per 33 oz. of water and a little more for stubborn weeds. You will need to be careful to not let it reach the flowers though.


  • Targets the roots of the plant
  • The high concentration which means you need less of the product to do the job
  • Can work on lawns of large areas


  • Some customers found the instructions on the product to be unclear
  • Takes slightly longer to see results

Related: Fire Ant Killer

3. Scotts Halts Crabgrass & Grassy Weed Preventer (for 15,000sq-ft)

The Scotts Halt is a weed preventer that needs to be used before the infestation of weeds. It is also one of the products featuring an advanced weed grip technology.

Scotts Halts Crabgrass & Grassy Weed Preventer (for 15,000sq-ft) Check Price on Amazon

The Scotts Halt Weed Preventer does not affect the rest of the flowers which is a bonus. As the Halt Weed Preventer is not affected by the cold, it can be used anytime during the year.

It works on adult weeds with a single application, unlike some formulas, it also kills juvenile and hidden weeds that are often missed.  This way instead of the short-term results that comparable products offer you get fast and long-lasting results on a budget.

Another factor that customers liked is that it can treat wide areas of more than 5,000 square feet. Scotts Weed Preventer also performs well on different weather conditions like rain, snow and hot summer without hampering performance.

The Scott Halt uses an active ingredient Pendimethalin, making this is a selective herbicide. It will prevent germination of seeds so you will have to wait four months before planting flowers.


  • Suits different weather conditions
  • Can work on tough weeds
  • Safe to use around children and pets
  • Affordable


  • This product can stain your hand and clothes so you would need to take precautions

4. Preen 2464083 Garden Weed Preventer

While the Preen Weed prevention does not kill the weeds present in your flowerbed, it will prevent new weeds from growing and taking over your garden. For best results, you will have to remove weeds from your flower bed.

Preen 2464083 Garden Weed Preventer Check Price on Amazon

This product works on 27 types of flower weeds while not affecting the growth of 200 common flowers like roses, trees, vegetables, and shrubs. Customers have found that it works on any plant as long as it has grown to 2 to 3 inches tall.

The optimal time for applying the first round would be around spring. It is easy to apply and involves sprinkling the product on the soil or mulch. Generally, 1 ounce of Preen works per 10sq. Feet of soil. Water activates Preen and you can use a hose or a sprinkler to do so.

It can affect the growth of the flowers so you need to be careful while using it. Many customers place a barrier like cardboard around their flowers while applying the Preen formula. However, the spray is safe and can be used on flowering plants that have germinated.

Another feature we appreciate is that it does not get washed away in the rain and stay on the surface of the soil for long. This means that you do not have to reapply from often. Preen recommends that reapplication can be done every 9-12 weeks.

As it works like a weed preventer, it eliminates the need to get hands dirty and pull out weeds. Preen comes with a power spreader cap which allows you to measure precisely.


  • Works on a wide variety of weeds
  • Can be used in all season
  • An applicator scoop is included
  • Easy application


  • Needs to be applied when the soil is dry as it can cause discoloration of leaf damage otherwise
  • Reapplication during mid-season is important to maximize weed prevention

5. Roundup Weed and Grass Killer Concentrate Plus

Roundup works to kills pre-existing weeds and prevents new ones from sprouting for up to four months. The weeds begin to wilt in 2-4 days and will be eradicated completely within 2 weeks.

Roundup Weed and Grass Killer Concentrate Plus Check Price on Amazon

It is easy to apply and requires you to mix the concentrate with a given (on the label) amount of water.

With a 50.2 % concentration of glyphosate, it can work on the toughest of weeds like vines, poison ivy, and poison oak. It comes in a pre-mixed formula which will save you time and the cost of a separate sprayer.

Round up beings its action after just 3 hours of spraying. It takes only 30 minutes to be rainproof which is an added bonus. It also works as a pre-emergent weed killer and tackles both timelines of weed!

This product will not damage your flowers however, be sure not to overspray it as you can risk slowing their growth. This product is a little heavy duty but works well if you don’t want to spend a little more for extra features.


  • Works as a Pre-and post-emergent herbicide
  • Offers up to four months of protection against new weeds
  • Can get rainproof within just 10 minutes
  • Affects the roots of the weed maximizing efficiency


  • Has a potent concentration so you must be careful not to reapply around edible plants and trees
  • Since it comes pre-mixed, it will not last as long as the other weed killers on this list

6. Natural Weed Killer Made with Ocean Water and Vinegar 

This Natural Weed Killer does not use chemical ingredients to deal with weeds. It uses natural ingredients such as commercial-grade vinegar, salt water, and soap. This makes the Natural Weed Killer safe to use around pets and kids.

Natural Weed Killer Made with Ocean Water and Vinegar Check Price on Amazon

The product is non-selective but will not damage your flowers or leaves. It is easy to use and comes with a spray bottle. The Natural Weed Killer starts working within 12 hours of spraying and destroys the weeds completely by 24 hours.

This product is great for organic gardeners out there. Another plus point is that its non-toxic formula will not contaminate your groundwater or soil. The company also claims that it is sustainable which is a huge differentiator among other competing products.

Despite not having any chemicals, the product has a long shelf life and claims to last for 4 years.


  • Is safe for use around kids and pets
  • Is made of sustainable materials and is environmental-friendly
  • Provides highly effective and fast results
  • Easy to apply


  • The smell may be strong so some people
  • Priced higher than competitors

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Guide to Buying a Weed Killer for Flower Beds

To help you decide which weed killer would work best for flower beds, here are some factors to think about.

1. Ingredients 

To be able to choose the right product, it’s essential to also find out the ingredient that is used. Below is the list of the most popular ingredients found in weed killers:

  • Glyphosate: An agro-chemical, this is the most common ingredient used in mass-manufactured products.
  • Boric acid, Borax, and Borates: Easily available, these chemicals are often used for DIY.
  • Corn Gluten Meal: This is not very heavy duty and works for common, less-aggressive weeds.
  • Clopyralid: This is most commonly used to deal with broad-leaved weeds.
  • Diuron: A heavy-duty herbicide, this requires careful handling.
  • Natural: In recent times, we can find gentler and environmental methods like vinegar and soap being used

2. Methods of chemical treatment:

There are two primary methods of dealing with weeds such as:

Pre-emergent Weed killer:

  • There are a lot of weed killers out there and some of them are designed for killing the problematic weeds. But we recommend taking care of weeds before they’ve popped up. For that, you’ll need a pre-emergent weed killer which is a protective barrier to prevent weeds from sprouting.
  • It stops the seeds of the weed from germinating and if they have sprouted, it will stop them from taking root. Such products are best used in the edges of paths, fences, and other hard surfaces.

Post-emergent Weed Killer:  

  • Post-emergent weed killers work after the weeds have germinated and broken the ground. The advantage is that you wouldn’t have to hand pluck the weeds from the ground.
  • Now be very careful with choosing a selective or non-selective weed killer. A selective weed killer will not damage any other plant/flower beside the weeds while a non-selective will damage anything it comes in contact with. Choose a non-selective weed killer only if your flower bed is rampant with weeds.


Pesky weeds can ruin your hard work of growing and maintenance a flower bed. But with so many options out there, it can be difficult to choose the best weed killer that suits your requirements.

That is why this in-depth review has been made after a lot of research and testing a wide range of products so that you can find something that will definitely work.


  1. Evaluation of weed control efficacy and crop safety of the new – NCBI
  2. Weed control – Wikipedia
  3. Trends in glyphosate herbicide use in the United States and – NCBI
  4. Roundup (herbicide) – Wikipedia


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