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

Model #: 97185

12 reviews
0 5 4.1



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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 Concern® 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

Use Concern® Weed Prevention Plus® 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…

Not for Application on Existing Weeds

Corn gluten cannot be used to kill existing weeds. Because the weeds have already sprouted, corn gluten is 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) 25 lb bag


  • 25 lb bag
  • Covers 1500 square feet
  • Contains Corn Gluten Meal (82%), BoneMeal (4%), Potassium Sulfate (8%) and Wheat Middings (6%)

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
February 3, 2020
High By Jim

Order shipped promptly, delivery was swift, packaging was very good. Effectiveness of product remains to be seen. Application went smoothly in December. Looking forward to see how well Concern Weed Prevention Plus does for preventing weeds this spring.

Review Rate
Review posted on
March 18, 2019
Great organic alternative By Paul

Great organic alternative to the typical "weed n feed". Greened up my lawn nicely and kept out weeds (my lawn was already fairly weed-free). Didn't seem to prevent clover, but worked well against dandelions and crabgrass which are everywhere in my neighbor's yard. Main drawback is the cost/1000sft (yikes!). I will keep using though, since the cost is well worth avoiding the nasty chemicals in typical preemergents, with little kids and pets playing in my grass daily.

Review Rate
Review posted on
February 3, 2019
Disappointed By Bill

I used this product last spring with okay, not great results. I also applied it last fall and results are horrible — I’ve never had more early weeds. I purchased an extra bag for spring application; if results don’t improve then I’m moving on to something else.

Response From Safer Brand®
Kathryn : Consumer Relations Representative

We are sorry to hear that you have not experienced the high level of success we typically see with this product and would like to know more. Please contact our Consumer Relations Team at 1-855-7-ORGANIC (1-855-767-4264) for assistance. We are happy to help!

Review Rate
Review posted on
April 27, 2018
I've used this for years and love it! By k2

I've used this for years and love it! It's too early to comment on my most recent purchase (my first purchase from the Safer Brand website) yet. I find that some bags are useless, some are quite useful. I suspect that warehouse storage conditions prior to retail sale might effect usefulness?

Review Rate
Review posted on
March 24, 2018
Dogs (and mice) eat the dry fertilizer By Cabermon

Just applied today to our back yard. Purchased this product for pet safety because we get crabgrass, and it's our dogs' yard. I'd stored the bag in our carport for just 2 days, and noticed a mouse hole chewed in the bottom of the bag. Hmmmm... After applying, we noticed our small mixed breed dog sniffing the yard and eating the fertilizer granules. I'm sure the corn gluten is not harmful, but am worried about the fertilizer. IMMEDIATELY watered-in the fertilizer. Will submit another review later in the season regarding the effectiveness of the weed preventative.

Review Rate
Review posted on
June 20, 2017
Looking forwood to using this product By Jack

Have not applied this yet . When can I apply this product

Response From Safer Brand®
Lauren : Consumer Relations Representative

Hello Jack,

The first application to your lawn should be in early spring, approximately 3-5 weeks before weeds begin to sprout. This is about the time when daffodils and crocus flowers are in bloom. We recommend reapplying in late summer when the temperatures become cooler to help combat late season weeds. If using in a garden, it can be applied at any time.

Please feel free to contact our Consumer Relations Team at 1-855-7-ORGANIC (1-855-767-4264) with any additional questions.

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
June 16, 2016
Great Products By R624
I buy this very year as we have a dog and like the safety feature yet I have a nice lawn. Like the free shipping and it comes right to our door.
Review Rate
Review posted on
May 5, 2016
Save my back and free delivery right on my door By jkwh17
This is the second year I bought for a whole year program for my 10K sf lawn. Totally pleased.
Read All Reviews (17) Write a Review
Q.Will Concern control yellow foxtail?

This product will prevent seeds from germinating when applied at the correct time of year for that seed.

Q.I am assuming this is not safe for those with Celiacs or pets with grain intolerance?

The active ingredients in this product are Corn Gluten Meal, BoneMeal, Potassium Sulfate, and Wheat Middings. We advise contacting your doctor or vet with these ingredients for medical recommendations.

Q.Hello, You cite that this product will control Quackgrass. I have sections of my lawn that where quackgrass is prevalent. I believe it was introduced during the hydroseeing and straw application from the builder. I have not been able to find a method to control Quackgrass. If I apply this product in the spring, will this prevent existing Quackgrass from coming back or will it only prevent new quackgrass from growing? Thank you!

This product will prevent new seeds from germinating and will have no effect on established weeds.

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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

More 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, then consider a herbicidal soap that is 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.


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 2-3 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 even 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.

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