Concern® Weed Prevention Plus® 8-2-4 25lb

Model #: 97185

7 reviews
0 5 4.5

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  • Prevents weeds while fertilizing your lawn.
  • Covers 1,500 sq ft total (1 bag).
  • Will not burn your lawn.
  • 90% effective weed control in the first year.
  • Easy to use and to distribute evenly.
Cannot Ship To: MN, PR, VA

How It Works

An effective plan of attack against weeds is to get them before they start! Concern® Weed Prevention Plus® is powered by corn gluten meal, bone meal and potassium sulfate. Corn gluten meal suffocates and suppresses weeds before they begin to grow, while bone meal and potassium sulfate gently fertilize your lawn for lush, green grass.

Corn gluten is a by-product of the cornstarch manufacturing process and it has the ability to prevent seeds - especially those seeds of pesky weeds found in your lawn and garden - from growing roots and maturing. Corn gluten meal is combined with a natural fertilizer in Weed Prevention Plus® to give your lawn a nutrient boost for fast green up and growth.

Get Ahead of Weeds Before They Start

When using a weed pre-emergent, timing and temperature are key. Be sure to apply Weed Prevention Plus in early spring, so you attack bothersome weeds before they sprout! As a general rule, Weed Prevention Plus® should be applied when crocuses begin to bloom or when forsythia blooms start to drop. This timing will vary depending on different geographical locations and climates.  

It’s extremely important that you apply Weed Prevention Plus early in the spring while the weeds are still germinating below ground. Once applied, the corn gluten meal works to prevent weed seedlings from successfully germinating. And the best part is that children and pets can play on the lawn immediately after application since Weed Prevention Plus® is composed of natural ingredients!

Lawn Food for Fabulous Lawns

Using Weed Prevention Plus® not only prevents weeds, it also fertilizes your lawn at the same time! The slow release fertilizer will be released into your lawn at a steady rate over a few weeks to encourage the growth of lush, green grass without burning your turf.

With an NPK analysis of 8-2-4, your lawn is getting the important macronutrients it needs to grow healthy and strong. So what exactly do these numbers mean and why are they important for lawn growth? Below is a simplified breakdown of each one:

8% N=Nitrogen – promotes leaf growth & fast green up

2% P=Phosphorous – supports flower & fruit development

4% K=Potassium – helps deep root development & general plant health

These numbers are all important because they show the percentage of each macronutrient contained in the fertilizer. Higher numbers don’t necessarily mean a better product when comparing the NPK of different fertilizers. What’s important is how these nutrients are released into the soil. When nutrients are released at slow and proportionate rates, there’s less chance of you finding burn spots throughout your lawn.

Nitrogen is the most important macronutrient for lush, green lawns, so that’s why it comes in at the highest number: 8%. Potassium is great for promoting strong roots and overall lawn health, so that’s why ours has 4%. Phosphorous is not as important for lawns to grow, so we’ve only included 2% phosphate in Weed Prevention Plus®. Since lawns stay in the vegetative state for the entire life cycle, there’s no need for extra of this bloom encouraging nutrient.

How to Apply

Take special note of the weather conditions for the next few days following your application of Weed Prevention Plus® on your lawn. For best results, make sure there is a going to be a few rain-free days in a row after you apply. After Weed Prevention Plus® is spread throughout your lawn, thoroughly water your entire lawn to ensure the corn gluten meal begins to absorb into the ground. Then, allow it to dry out over the next few days, and as weeds try to sprout, their roots will die and they won’t be able to develop.

If you’re looking to grow new grass on your lawn, you will need to wait at least 6 weeks after your application of Weed Prevention Plus® to sow new seeds. Because corn gluten meal is so effective at suppressing seed germination, it can potentially suppress the growth of new grass seed as well.

Great for Gardens

Weed Prevention Plus® is great for preventing weeds in and around flower, fruit and vegetable gardens as well! Corn gluten meal doesn’t change soil pH, and it won’t harm any of your established plants, so feel free to spread it around your blooming tulips and growing tomato plants. If you’re transplanting already sprouting fruits and vegetables into your garden, they’ll be safe around Weed Prevention Plus too. And, the added fertilizer will help them grow big and strong!

If you’re looking to start your garden from seed, then you’ll need to wait 6 weeks to plant your new seeds after applying corn gluten meal to your garden soil.

Effective Against a Variety of Weeds

Weed Prevention Plus® is effective against a variety of common garden and lawn weeds including:

  • Annual Bluegrass
  • Barnyardgrass
  • Black Medic
  • Black Nightshade
  • Buckhorn Plantain
  • Catchweed Bedstraw
  • Clover
  • Crabgrass
  • Creeping Bentgrass
  • Curly Dock
  • Dandelions
  • Green & Giant Foxtails
  • Lambsquarter
  • Orchardgrass
  • Purslane
  • Quackgrass
  • Redroot Pigweed
  • Shattercane
  • Velvetleaf
  • Wooly Cupgrass
  • And much more…

Existing Weeds

Corn gluten cannot be used to kill existing weeds. Because the weeds have already sprouted, corn gluten’s powers are ineffective at suppressing the weed’s root growth. In fact, by applying corn gluten meal to existing weeds, you’ll actually be feeding it like you’re feeding your lawn because of the fertilizer in Weed Prevention Plus®.

In order to kill existing weeds, more extensive measures will need to be taken. Use a contact weed killer like Safer® Brand Fast Acting Weed and Grass Killer to kill weeds on contact. This weed killer is compliant for use in organic gardening and won’t move through your soil to damage nearby plants and grass. And, if you can, place mulch on top of the established weeds you killed to further prevent regrowth and new blooms.


Concern® Weed Prevention Plus® for Lawn Care 8-2-4

Product Features:

  • Up to 90% effective weed control in the first year on dandelions and crabgrass
  • Will not burn
  • Homogenous pellet for uniform nutrient and herbicide distribution

What's in the Box:

  • (1) 25lb bag


  • 25lb bag
  • Covers 1500 square feet
  • Contains corn gluten meal (82%), nitrogen (8%), phosphate (2%) and potash (4%)

Disclaimer: Safer® Brand does not endorse any information contained in product reviews. Please follow all label instructions for your specific use.

Most Recent Customer Reviews

Review Rate
Review posted on
August 12, 2016
By Tony c
Review Rate
Review posted on
July 6, 2016
does the job!! By pfconsul
first time buyer of product. Notice good results as grass became fuller without friends. Recommend for all
Review Rate
Review posted on
April 1, 2016
Works great - and safe to boot! By BoomShackle the stallion
Recently purchased a bag and I am already seeing great results. I always worried about putting traditional weed killer down because we have a dog who loves our yard, but with this stuff I no longer have any "concern" Thanks!
Review Rate
Review posted on
October 21, 2015
Can't Give a Review on Effectiveness Yet By Shortfeather
This is a pre-emergent weed killer, that I applied a week ago. Won't know if it works until around February here in the FL Panhandle. The buying experience, shipment, and packaging were great. Best price on the market that I was able to find.
Review Rate
Review posted on
April 26, 2015
Very pleased with results By
I tried Concern for the first time in 2014. I have used CGM products before, but Concern has been the best I have tried, so I ordered again. As has been said, timing is critical--really with ANY preemergent. I've read that ground temperature is the important factor. There are websites that report the ground temperature, so do some research for your area. Another rule-of-thumb I've read is to apply preemergent after the forsythias bloom, but before they drop their petals. I try to apply before a rain, otherwise I water it in right away so the birds don't eat it all up!
Review Rate
Review posted on
April 4, 2013
Amazon Review By
you gotta get it down about 3 weeks before you think you might start seeing the dandelions, though. If you get it down before the neighbors weeds start blowing onto your lawn, you're golden.
Review Rate
Review posted on
March 12, 2011
Review Posted on By
We use this to keep our pets safe and still be able to have weed protection. Two drawbacks: 1) my pets like the way it tastes and eat it (it is corn meal gluten, after all)and 2) you have to make sure you get the application timing just right for it to work.
Read All Reviews (7) Write a Review
Q.I have a Scotts rotatory spreader.what is the correct setting for the concern product???

When applying with a hand spreader, use the setting noted for pelletized fertilizer.

Q.I live in Denver, co. When should I apply concern?

We recommend applying this product when the soil temperature is above 55°F.

Q.Lawn has crabgrass,dandelions, clover although I like the clover. Aerated 2 weeks ago and thinking of fertilizing with Concern Lawn food and reseeding. Should I wait to reseed in the spring when it's warmer and just fertilized now? I'm new at this!

The first lawn application of this product should be in the early spring, 3-5 weeks before weeds begin to sprout. It should then be re-applied in late summer when temperatures turn cooler to control late season weeds. Apply to gardens at any time.

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All About

All About Weeds

Unwanted weeds can cause harm in your garden if left unattended. They can crowd out the flowers and vegetable plants you have worked hard to cultivate.

Weeds can also cause damage to sidewalks and cause cracks in driveways and other outdoor surfaces; and let’s not forget how weeds can take over a backyard.

Weeds are typically just plants that are growing in the wrong place. Most weeds are just the natural flowers and plants that grow in your area and some may have been introduced in the past for medicinal, culinary or decorative purposes. So if you are wondering how to classify weeds basically, if you didn’t plant it, and you don’t want it in your lawn or garden, it’s a weed.

Unwanted weeds can cause allergic reactions for some people; some of them have jagged leaves and many of them are unruly and well, they grow like weeds, taking over your garden and crowding out the plants you have spent time, energy and money on cultivating.

Control Options

Control Options for Battling the Weeds in your Yard

To control weeds, maintenance is key. If you’re looking for organic control options so you can still walk in your grass and spend time in your garden without worrying about the harmful effects of chemical residuals, read about the two types of solutions for weeds that are approved for organic gardening.

Herbicidal Soap

A contact killer, herbicidal soap will kill any weeds or grass that you spray it on and only those plants. The great thing about herbicidal soap is it won’t run through the soil and it won’t kill nearby plants.

It works great to kill weeds or unwanted grass within hours on sidewalks, driveways, between cobblestone walkways or outdoor pavers.

Also, spray it in your flower bed on those pesky plants you don’t want around. Just make sure you don’t accidentally spray it on your flowers, vegetable plants or other ornamentals because herbicidal soap doesn’t differentiate between plants you like and weeds you don’t like.

Use herbicidal soap as needed throughout the gardening season to keep weeds that happen to sprout up, under control.

Corn Gluten

Corn Gluten is a natural, pre-emergent, herbicide, which means it kills the roots of sprouting seeds before they can take hold so the weed will never grow. It works best if you mix it with mulch or into the soil for flower beds or apply it to the lawn then water it. If it rains heavily in the 2-3 days after the initial application, you’ll want to reapply, so watch the weather forecast. Reapply every 3-5 weeks for best results.

If you apply corn gluten in the early spring to your flower bed, vegetable garden or lawn, you’ll be greatly reducing the number of weeds you have to spray with herbicidal soap or pull throughout the growing season.

If you are planning a garden that you’ve planted from seeds, don’t use corn gluten until the flowers or vegetables you’ve planted are firmly established plants; otherwise corn gluten is a safe, natural way to control weeds throughout the season on all plant types. You can even use it on fruits and vegetable crops, up to the day of harvest.

If you love feeding the birds, but hate the mess and all the weed and grass that grows from the seeds all over the ground, sprinkle an ample amount of corn gluten into the ground below the feeder to stop those seeds from germinating.


Expert Tips for a Beautiful Garden!

Gardening can be a very rewarding and healthy undertaking. By using organic products and methods, plants grow better, insect pests can be controlled, plant diseases can be eliminated, and lush harvests can be enjoyed!

Learn More:


Tips for Using Concern® Weed Prevention Plus® for Lawn Care 8-2-4

This product is effective against:

Barnyardgrass, Smooth Crabgrass, Curly Dock, Green Foxtail, Black Nightshade, Orchardgrass, Shattercane, Purslane, Wooly Cupgrass, Giant Foxtail, Lambs quarter, Buckhorn, Quackgrass, Velvetleaf, Annual Bluegrass, Dandelions, Creeping Bentgrass, Black Medic, Redroot Pigweed, Catchweed Bedstraw, Clover, and other common garden weeds.


  • When used as directed, Weed Prevention Plus will not harm beneficial insects, soil organisms, pond, or stream life. There's no waiting, warnings, or worries.
  • Weed Prevention Plus is composed of 100% granulated corn gluten meal. Children and pets can play on the lawn immediately after application.
  • Since Weed Prevention Plus kills only the root of sprouting seeds, it can be used with confidence around established plants, including transplants, flowerbeds, shrubs, and roses.
  • When your flower or vegetable sprouts have true leaves, it is safe to apply weed prevention plus even up to the day of harvest.

Directions for Use

How to use convenient shaker bag:

Tear off bottom of bag at perforation and pull apart re-sealable closure to expose shaker holes. Hold bag by handle and shake to dispense. If product clumps, re-seal and drop onto hard surface. Zip seal at bottom for easy storage.


Prepare garden bed by turning under or pulling established weeds, then sprinkle by using the convenient shaker bag or apply by hand around bedding plants, flowers or shrubs. Rake lightly into soil. Weed Prevention Plus works best if applied, watered in, and allowed to dry for 2-3 days. If excessive rain occurs, reapplication may be necessary. It keeps working 4-6 weeks. Re-apply as needed. Do not apply on newly seeded areas. However, it can be used with confidence around transplants.


Spread Weed Prevention Plus evenly over lawn grass using the shaker bag, by hand, or in spreader. Avoid any bare spots where you are re-seeding. Sprinkle in cracks on sidewalks and driveways. Weed Prevention Plus works best if applied, watered in and allowed to dry for a period of 2-2 days. If excessive rain occurs, reapplication may be necessary.

Application Rate:

Apply 5 lb per 250 sq ft (25' x 10') to turf or garden soil. If you choose you can use twice the recommended rate for eve better control with no fear of burning plants.

When to Apply:

Your first lawn application should be in the early spring, 3-5 weeks before weeds begin to sprout. This is about the time the crocus and daffodils are blooming in your area. Re-apply in late summer when temperatures turn cooler to control late season weeds. Apply to gardens at any time.


FAQs About Concern® Weed Prevention Plus® for Lawn Care 8-2-4


Q: How long do I need to wait before allowing my children or my pets on my lawn after applying Weed Prevention Plus?

A: Children and pets can play on the lawn immediately after application of Weed Prevention Plus.


Q: When should I first apply Weed Prevention Plus?

A: Your first lawn application should be in the early spring, 3-5 weeks before weeds begin to sprout. This is about the time the crocus and daffodils are blooming in your area.


Q: Can I use this on my newly seeded garden?

A: If you are planning a garden that you’ve planted from seeds, don’t use corn gluten until the flowers or vegetables you’ve planted are firmly established plants.


Q: How does Weed Prevention Plus work?

A: Weed Prevention Plus is made from Corn Gluten. Corn Gluten is a natural, pre-emergent, herbicide, which means it kills the roots of sprouting seeds before they can take hold so the weed will never grow.