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  • Fiesta Weed Killer
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Fiesta Weed Killer

4.1 out of 5 stars 1,082 ratings
#1 Best Seller in Weed Killers
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Product information

Technical Details

Manufacturer reference ‎30550
Parcel Dimensions ‎28.8 x 18.2 x 11.3 cm; 5.7 kg
ASIN ‎B0851QQ398

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Fiesta Weed Killer

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Product details

  • Parcel Dimensions ‏ : ‎ 28.8 x 18.2 x 11.3 cm; 5.7 kg
  • Date First Available ‏ : ‎ Jan. 28 2021
  • ASIN ‏ : ‎ B0851QQ398
  • Manufacturer reference ‏ : ‎ 30550
  • 鶹 Rank: #95 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • Customer Reviews:
    4.1 out of 5 stars 1,082 ratings

Customer reviews

4.1 out of 5 stars
1,082 global ratings

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Works Well
5 out of 5 stars
Works Well
I found Fiesta Weed Killer works well when used properly. Make sure to apply it on a hot, sunny day (30°C+) dry temp. For best results, I recommend applying it twice/repeat the same day. Also, be careful with mixing—follow the instructions closely and use the correct ratio of water and product. Overall, I’m happy with the results.
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Top reviews from Canada

  • Kevin
    5.0 out of 5 stars Amazing weed killer !
    Reviewed in Canada on July 25, 2025
    Verified Purchase
    Fantastic weed killer! A little pricey but overall very concentrated and will last for many applications. Did a great job killing broad leaf weeds and clover in my lawn.
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  • Beth-Lynn
    4.0 out of 5 stars Patience and it lasts
    Reviewed in Canada on May 27, 2025
    Verified Purchase
    We purchased this knowing that lawn care companies in Canada use it, and knowing that dicamba and tryplocor are unavailable here and would work faster and better. This is straight up iron. It’s a deep red rust colour and you will see your lawn darken for a few days (but not brown) after using it. You need a 2-gallon sprayer on fan mode. There are websites that give a ratio of water to product better than the bottle does so you know what strength to use for best effectiveness for your efforts. It goes a long way and lasts several applications. It’s a lot in a jug so lasts a while. Be patient. Yes dandelions will brown. So will clover. Well established clover will take several spaced apart applications. Creeping Charley is a no, it won’t touch it. It’s broadleaf only. Remember lawn companies often just spot treat. They don’t do a full service after maybe one time. This for the money gives you control so you can do it yourself as much as you think needs doing with no harm to the grass. Way better than the hundreds lawn services charge for the same product.
    8 people found this helpful
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  • Razaul
    5.0 out of 5 stars Works Well
    Reviewed in Canada on July 25, 2025
    Verified Purchase
    I found Fiesta Weed Killer works well when used properly. Make sure to apply it on a hot, sunny day (30°C+) dry temp. For best results, I recommend applying it twice/repeat the same day. Also, be careful with mixing—follow the instructions closely and use the correct ratio of water and product. Overall, I’m happy with the results.
    Customer image
    Razaul
    5.0 out of 5 stars
    Works Well

    Reviewed in Canada on July 25, 2025
    I found Fiesta Weed Killer works well when used properly. Make sure to apply it on a hot, sunny day (30°C+) dry temp. For best results, I recommend applying it twice/repeat the same day. Also, be careful with mixing—follow the instructions closely and use the correct ratio of water and product. Overall, I’m happy with the results.
    Images in this review
    Customer image
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  • Jeff
    5.0 out of 5 stars It works well on clover and plantain
    Reviewed in Canada on September 5, 2024
    Verified Purchase
    Tried to use Wed B Gone to kill plantain. It only blackened the leaves but the weed came back to life within two weeks. Fiesta killed the plantain and large patches of clover that were on my lawn. At first it looked like nothing happens. The next day the weeds were not shiny green. By the third day, the weeds were visibly dying. Beware that the herbicide stains the weeds and your lawn will look brown in the areas that you sprayed for 7-10 days. It will disappear as the grass grows and rain falls on it. I would recommend this herbicide.
    7 people found this helpful
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  • Michael
    3.0 out of 5 stars 50% efficiency
    Reviewed in Canada on July 3, 2025
    Verified Purchase
    It’s working somehow but only killed half of weeds in my lawn. Killed dandelion and some wider leaves weeds. Not working for a Lot of other weeds such creepy buttercup, cranesbill and the tiny daisy with white flowers. They are still blossoming very well and outstanding after others were killed. The efficiency can be 50%. I sprayed once early summer and believe have to do it multiple times through the year.
    Customer image
    Michael
    3.0 out of 5 stars
    50% efficiency

    Reviewed in Canada on July 3, 2025
    It’s working somehow but only killed half of weeds in my lawn. Killed dandelion and some wider leaves weeds. Not working for a Lot of other weeds such creepy buttercup, cranesbill and the tiny daisy with white flowers. They are still blossoming very well and outstanding after others were killed. The efficiency can be 50%. I sprayed once early summer and believe have to do it multiple times through the year.
    Images in this review
    Customer image
    One person found this helpful
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  • Adriel Ziesemer Jr.
    4.0 out of 5 stars Probably the best legal herbicide in Ontario
    Reviewed in Canada on July 11, 2025
    Verified Purchase
    Worked well at the proportion of 1 cup per gal of water + a spoon of soap.
    It snowed out most of the weeds, including clovers. It is better when applied using a fine spray so all plant gets wet. May require more than one application for some weeds. Worked very well for dandelions.
    It also seems to be very safe to apply since iron oxide is the main ingredient.
    More effective than that only illegal toxic stuff from the US/other provinces.
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  • John
    5.0 out of 5 stars Working Well
    Reviewed in Canada on June 19, 2025
    Verified Purchase
    Working great for me. It hasn't completely wiped out the clover, but a large majority of it has browned up very well. I'm fully expecting to have to do multiple applications over the next year or two to completely kill it, but that's just the reality of non-banned herbicide these days. These iron-based chemicals don't do a great job of traveling down to well established roots to kill the entire plant like the old ones do.

    This is working better than anything else I've used in recent years. I'll happily continue to use this.
    3 people found this helpful
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  • Robert D.
    4.0 out of 5 stars Updated to earlier review: Ummm. Yes. This works 100% on broadleaf weeds
    Reviewed in Canada on April 30, 2023
    Verified Purchase
    100% this works on broadleaf weeds. Dandelions as the best example. All - I mean all - weeds that were sprayed (mix approximately 1 Cup (250 ml) of product to 6 litres of water + AG 12102 Sticker Spreader) and I have the best weed control of broadleaf weeds I've seen.

    All weeds are dead black within a few days and now after two days of rain, they have essentially rotted away from the landscape. To put this into perspective, I must have sprayed 300-500 places in my lawn and they are all gone. Nothing I've ever used has been this effective.

    I think the AG Sticker Spreader is the key to the process.
    In any case this combo, in my case was 100% effective. 100%.

    I simply used a $25 pump-pressure sprayer purchased at another retailer to apply it to the areas of concern.

    Totally. Totally satisfied with this product, which makes approximately 100 liters of effective weed control that you can reapply to spots you've missed as these damn weeds will pop up when you don't see them when they are small.

    This Fiesta Weed Killer does not work on weed grasses.
    This is broadleaf weed product as specified by the producer.

    note: If you want to kill grass in cracks, grassy weeds, moss, (anything really) I would suggest people look at the "other" products that Nuedorff makes. Just look online and find it here on 鶹, like I did.
    43 people found this helpful
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