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Nitrophos Barricade Granular Pre-emergent Herbicide

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Barricade Herbicide by Nitrophos contains Prodiamine and is designed for the pre-emergent control of grassy and broadleaf weeds in established turfgrass and many other non-crop areas. Barricade must be applied previous to the seed germination or following the removal of existing weeds in order to obtain control of target weeds.

Target Pests

Barricade is used for pre-emergent control of grassy and broadleaf weeds such as barnyardgrass bluegrass carpetweed chickweed crabgrass foxtails goosegrass henbit itchgrass johnsongrass knotweed kochia lovegrass pigweed rescuegrass spurge witchgrass and yellow woodsorrell.

For Use In

Barricade Herbicide is for use in established turfgrass lawns sod nurseries container ornamentals feild grown ornamentals landscape ornamentals conifer nurseries seedling nurseries rights of way roadways roadsides railways equipment yards tank farms pumping stations parking areas storage areas ungrazed fence rows and christmas tree farms.


Barricade is applied with a broadcast spreader at a rate of 10 pounds per 5000 square feet.

Coverage Area

Each 10 lb bag will treat up to 5000 square feet.

Time to Kill

Barricade is specifically for pre-emergent control of grassy and broadleaf weeds.

Active Ingredient

Prodiamine .58%

Nitrophos Barricade Granular Pre-emergent Herbicide

Using Barricade Pre-Emergent Herbicide To Treat Your Lawn

If you're looking for a herbicide that will keep those pesky weeds from emerging in the first place, Nitrophos Barricade pre-emergent herbicide is the product for you and will be a great assistance in keeping your lawn weed-free in the Spring.  Barricase has the ability to prevent the growth of a wide range of different weeds such as Barnyardgrass, Annual Bluegrass, Carpetweed, Chickweed, Large and Smooth Crabgrass, Crowfootgrass, Woolly Cup Grass, Annual Foxtails, Goosegrass, Henbit, Itchgrass, seedling Johnsongrass, Junglerice, Knotweed, Kochia, Common Lambsquarters, Lovegrass, Browntop, Fall and Texas Panicum, Pigweed, Common Purslane, Florida Pusley, Rescuegrass, Shepherdspurse, Signalgrass Broadleaf, Persian Speedwell, Sprangletop,Prostate Spurge, Witchgrass and Yellow Woodsorrel from seed. It can be applied either separately or as an additive to other products to help save time.


How Nitrophos Barricade Pre-Emergent Works

Barricade is a pre-emergent herbicide meaning that it helps prevent weeds from showing up in your lawn. Herbicides in general use a variety of different mechanisms to stop weeds from growing, but pre-emergent herbicides specifically prevent growth after germination in the weed seed by inhibiting a particular vital enzyme in the seed. In other words, it's a form of birth control for the weeds that grow on your lawn. Due to its mode of action, Barricade only keeps seeds from sprouting and will not be effective in controlling weeds that have already emerged. This means that timing is very important if you want Nitrophos Barricade Pre-emergent to work as advertised. 


Safety Precautions to Consider

When it comes to applying any type of pesticides, even herbicides, you must pay close attention to safety. As an example of what not to do, a local college greenhouse had been advised to mix a couple insecticides together for a particular problem in the greenhouse; both student workers who applied the insecticide had trouble breathing following the application and had to stay home for several days, a reaction that could have had far reaching health and legal consequences for the student workers, the university and the supply company that recommended mixing the products. Another example is testing done on inert products in glyphosate, or RoundUp, which had been considered a fairly safe for general use based on tests of the glyphosate. The study found that an inert ingredient essentially smothered human cells, killing them, including embryonic, placental and umbilical cells, causing miscarriage.


By doing something as simple as checking the warnings on the Barricade herbicide label, you will be able to find the information needed to safely apply the herbicide. One of the first things to look at is what personal protective equipment (PPE) you'll need before applying it. This information is on one of the first few pages of the label. For Barricade, you'll want a shirt with long sleeves, long pants, socks, shoes and protective gloves. 


When you're done for the day or the season, it's very important to store herbicides safely. Keeping them where children cannot get to them whether it is in a locked cabinet or building, labeling and securely closing mix bottles to help ensure limited accidental exposure and makes it much easier to dispose of it properly.


Application Tips

There are many tips and tricks you can pick up to make herbicide application go faster and more safely. Whether you're spraying a liquid or dispersing granules of Barricade, you'll want to wait for a day that's relatively mild. If you live in a high wind area, starting on the downwind side of your property and working your way upwind will help keep the herbicide blowing away from you. If you do have to apply while there is a breeve, be very careful so your application doesn't drift over to a neighbor's property.  You do not want to get the pre emergent spray on landscaping that can't handle the application, so be careful!


Spring applications, which control summer weeds, should take place when the weather is at 65-70 degrees F during the day for four days in a row. Fall applications, which control winter weeds, need to wait until night air temperatures reach a low of 55-60 degrees for four days in a row. Measure how many square feet you'll need to treat around your yard and then use that figure to determine howmuch Barricade to mix or distribute. Check the label for the proper usage rates.


Why You Should Choose Barricade over Other Similar Herbicides

Barricade has little to no odor and forms a clear liquid. This gives Barricade an advantage over other herbicides in that it won't effect the appearance and/or color of the plants where they are treated.  Because it is relatively concentrated and does not take much to get the desired effect, it can be applied using a very low dosage. It is a relatively safeherbicide, and is not restricted in terms of who may use it and whether training, a certificate or a license is needed. Compared to other herbicide classes, pre-emergent herbicides help prevent work by keeping weeds from sprouting in the first place. It is very stable in solution, keeping it from settling out.


Now that you've had a chance to educate yourself about the basics of Barricade pre-emergent herbicide, you can start thinking about where and how to apply it to prevent weeds from popping up. By providing a good quality pre-emergent herbicide such as Barricade, you'll be able to enjoy your lawn more and weed it less.

Product Q & A

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Why did you choose this?
Solutions Stores Store
widely recommended for St Augustine grass.
James K on Aug 7, 2017
widely recommended for St Augustine grass.
James K on Aug 7, 2017
When do I apply it?
A shopper on Aug 9, 2017
BEST ANSWER: You will want to apply barricade in the spring and fall months for weed control to prevent emergent of weeds.
I typically use the Nitro-Phos Barricade product as a pre-emergent twice a year, since it works on both broadleaf and grassy weed. This month (Feb) I want to put down the Nitro-Phos Imperial 15-5-10 for an early green up, but it says it's also a pre-emergent. Can I use the Imperial in lieu of the Barricade and will it work to prevent both the broadleaf as well as the grassy weeds?
Kathy H on Feb 3, 2018
Nitrophos Barricade Granular Pre-emergent Herbicide
Nitrophos Barricade Granular Pre-emergent Herbicide
Nitrophos Imperial Lawn Fertilizer
Nitrophos Imperial Lawn Fertilizer
BEST ANSWER: The Imperial Lawn fertilizer would only work as a fertilizer I do apologize for the error in the description. For the Pre-emergent the Barricade would be what you would want to apply. You can apply both of the product and they would not cause any effects on each other. I would make them in separate applications due to the settings on the spreaders.
"Barricade is for selective preemergence control of grass and broad leaf weeds in lawns up to 5,000 sq.ft." - Is this statement for the 10 pound bag or the 50 pound bag? Thanks
BBsouthern on May 5, 2017
BEST ANSWER: The 10 lb bag of Barricade will cover 5,000 square feet.
Goran grass has taken over my flower beds where I have lily bulbs and day lillies planted. I want to dig up everything in the bed, treat the soil with a pre-emergent, and replant the bulbs. Bad idea?
Lynn F on Nov 25, 2017
BEST ANSWER: The barricade will not prevent the bulbs from coming up, so you can spray the entire flower bed with herbicide, say Glyphosate, then apply the pre-emergent, on top. Mulch and wait for the bulbs to return in the spring. Apply a second application of pre-emergent to the flower beds in the spring.

does this work on buffalo grass?
A shopper on Oct 27, 2017
BEST ANSWER: Yes, you can use a pre-emergent on Buffalo grass to control winter and spring weeds.
Safe for bermuda grass?
Kathy P on Sep 16, 2017
BEST ANSWER: Yes, Barricade can be applied to established lawns including bermuda.
How old should a newly seeded area be before using this product? Not just seeded - now about 7 weeks old.
Dawn C on Aug 11, 2017
BEST ANSWER: You will want to wait at least 8 weeks for a new seeded lawn to be established.
does it kill sand burrs?
A shopper on Feb 11, 2018
BEST ANSWER: I do not know. I follow Randy Lemon's Garden Line program for keeping your car healthy and strong and weed free. You could email him or call in on his radio show that comes on Saturday mornings . He can answer all of your questions. Just do a web search one his name.
Is this safe to use in an existing flower bed?
Diana B on Jan 10, 2018
BEST ANSWER: Sorry I haven’t applied this product yet. I bought it to apply to my NC Bermuda grass to control weeds. It looks like I should have put it down in mid December but I’m still learning about this method because some other green is already showing up. I would think it safe around ( established) plants.
50lb bag and a 10 lb bag together will it take care of 19,000 sqft of cool season turf ?
Gregory D on Oct 16, 2017
BEST ANSWER: Each 10 lb bag will treat up to 5000 square feet, so you would need at least 40lbs of Barricade.
It’s been crazy in Houston Area...39 one day then 72 the next...with rain every other day...can I apply this now to a damp lawn at 45 degrees when it will be 75 tomorrow?
A shopper on Feb 13, 2018
BEST ANSWER: I love in Katy. I haven’t applied mine yet, just waiting for a dry grass day. Wouldn’t apply it when it’s wet. Soil temps just need to be no more than 55 degrees I think and you’re ok.
is barricade applied as a granular or a liquid?
A shopper on Feb 8, 2018
BEST ANSWER: Barricade is applied as a granule and then needs to be watered in to activate, there are options for liquid pre-emergent if that will work better.

Does this product have a high percentage of nitrogen? Where can I view the analysis?
DannyDaze on Dec 4, 2017
BEST ANSWER: The active in this product is Prodiamine as a pre-emergent.

Prodiamine .58%
Should I use baricade in the fall and spring ?
Gregory D on Oct 7, 2017
BEST ANSWER: You should use Barricade pre-emergent should be used in the fall and the spring months, to control winter weeds as well as spring weeds.
What should the setting be on the Scotts speedygreen 2000 for Barricade Pre Emergence application ?
James J on Feb 20, 2018
BEST ANSWER: We recommend to use the spreaders at the lowest setting and applying to a 1,000 sq ft area for testing. If we still have a bit of product left after walking the 1,000 sq ft we can change the setting or just walk a little bit slower. For exact settings, we would need the barcode from the Scotts spreader.
Does this have nitrogen in it? I am looking for a pre emergent that is 0-0-7 with .25% barricade for my zoysia. Do you have this ?
Deb F on Feb 18, 2018
BEST ANSWER: Active Ingredient
Prodiamine .58%

This does not contain Nitrogen.
Does barricade work on lespedeza?
A shopper on Feb 14, 2018
BEST ANSWER: The Barricade will control all weeds that grow from a seed. Make sure to apply the product before germination to provide the best results.
Will this prevent crabgrass from growing?
Laurie P on Feb 14, 2018
BEST ANSWER: Yes the Barricade will prevent any weeds from growing if applied before they germinate.
Received a good rain overnight, with chance of more this evening. Is it ok to apply later today once things dry up a little, or should I wait for a day when the yard is completely dry first?
A shopper on Feb 10, 2018
BEST ANSWER: Before applying make sure the area is firm enough to walk on. If it is a muddy mess wait for the area to dry before applying. We will still need to lightly water the grains in after spreading.
Yesterday i cleaned weeds out of my rose garden and flower beds. Then it rained. Mulch wont get put down till 3 weeks. Can i use barricade today? It has rained this morning but not now but may rain this afternoon. Thank you
A shopper on Feb 6, 2018
BEST ANSWER: Yes, you can put the Barricade down, then if you are anticipating a light rain, it will be fine. Mulch on top will be great added layer of weed protection.
Is this a good time to put preamergent during the month of February when the lawn is dormant and the weeds are popping up?
A shopper on Feb 5, 2018
BEST ANSWER: You would want to apply the Barricade before germination begins, this will depend on your location.

We have a map and calendar on the website that will give you location and application times.

How does this compare to Pennington Pro Care Crabgrass Control?
Andrew S on Feb 4, 2018
BEST ANSWER: This product, Barricade has a higher percentage of Prodiamine but does not have any fertilizer added.

I do not typically recommend Weed and Feeds, they are not actually very good for your lawn.
Should I mow before applying?
A shopper on Feb 4, 2018
BEST ANSWER: I would recommend moving your lawn, so as to get the granules below the grass blades easier.
Is barricade safe for St Augustine lawns?
A shopper on Feb 2, 2018
BEST ANSWER: Yes, the barricade would be safe to apply on St. Augustine lawns
Is it safe to use on established zoysia?
A shopper on Jan 31, 2018
BEST ANSWER: Yes this will be safe to apply to any type of grass as long as it is established.
Does this control diffuse knapweed?
A shopper on Jan 31, 2018
BEST ANSWER: The Barricade will control any type of plant that is growing from a seed this would include the Knapweed. For Northern lawns make sure to apply at a rate of 10lb per 5,000 sqft and for southern lawns apply at a rate of 10lb per 2,500 sqft. The higher the rate of application the longer it will last in the soil.
Is this product recommended for bahia grass in Florida?
Terry C on Jan 30, 2018
BEST ANSWER: Yes, you can use Barricade Pre-emergent on Bahia grass in the Florida area.

We have a map of grass types of application months for reference.

What is the range in feet I should keep this product away from in regards to citrus trees ie:
lemon and orange?
Karen S on Jan 28, 2018
BEST ANSWER: This will not harm your fruit trees, it is pre-emergent and will only stop weeds from germinating.
Will Barricade kill/ retard grass burrs?
Herb N on Nov 13, 2017
BEST ANSWER: When barricade is applied at the correct times, it will prevent germination of grass burrs in your lawn. You will want to apply in early spring.
Does Barricade work on quackgrass and orchardgrass?
Doug H on Nov 11, 2017
BEST ANSWER: Yes, you can stop germination of quackgrass and orchardgrass by the application of a pre-emergent such as Barricade.

Customer Reviews

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Easy to Use
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Safe to Use
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Would you Recommend?
Yes (1)
Easy to Use
5 / 5
5 / 5
5 / 5
Safe to Use
5 / 5
Would you Recommend?
Excellent service, excellent product competitive price.
January 17, 2018
1 month ago
Good deal
Item was exactly as described. Havenâ??t used it yet.
October 21, 2017
4 months ago
Went down easy
First time using Barricade, so don't yet know if it will keep the weeds out of my lawn, but I got it on a recommendation.
October 17, 2017
5 months ago

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