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- – 4-month term
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Nov 12 – Nov 14
At a glance
- Condition
- New
- Weight
- 64 oz
- Liquid Volume
- 21 gal
- Item Form
- Spray
- Active Ingredients
- Herbicide
- Item Type Name
- weed-killers
- Coverage
- 6300 sq ft
- In the box
- weed-killers
- Warranty
- Warranty
Features 4
- Makes up to 21 gallons to ready-to-use spray solution
- Makes up to 21 gallons to ready-to-use spray solution
- Treats up to 6,300 Square feet
- Visible results in 12 hours
Specs 13
| Brand | RM18 |
|---|---|
| Item Weight | 64 Ounces |
| Liquid Volume | 21 Gallons |
| Item Form | Spray |
| Active Ingredients | Herbicide |
| Brand Name | RM18 |
| UPC | 737716754391 |
| Manufacturer | Ragan & Massey, Inc. |
| Unit Count | 64.0 Fluid Ounces |
| Part Number | 75439 |
| Model Number | 75439 |
| Item Type Name | weed-killers |
| Coverage | 6300 sq ft |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 12 – Nov 14
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Affirm Pay in 4
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- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Top Amazon Reviews
⭐️⭐️⭐️⭐️⭐️ Game-Changing Weed Control—Fast, Effective & Easy!
I’ve battled persistent weeds for years—on driveways, sidewalks, fence lines—you name it. Then I tried RM‑18 Weed Killer, and wow, what a difference! Within just a few hours of a targeted spray session, I noticed weeds drooping and losing their grip. By the very next day, they were completely toast. What makes RM‑18 stand out: Lightning-fast results – visible die-off in hours, total eradication in a day. User-friendly application – the spray nozzle distributes evenly and precisely. No overspray worries – perfect for gravel, concrete, and hardscapes. Long-lasting control – I haven’t had to reapply in high-traffic areas for weeks! This is hands-down the most effective and convenient weed killer I’ve ever used. Whether you're dealing with tough, deep-rooted weeds or light surface growth, RM‑18 delivers every time. I’ll definitely be using it all season—and keeping a backup bottle on deck. If you want weeds gone now, this is the product for you. Highly recommend!
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Reviewed in the United States on July 4, 2025 by ken
Kills everything it touches, so be careful!
I keep buying, works great for weeds along drive, road etc. works perfect for my rock weeds and they are plentiful! Just spray and dead!
Reviewed in the United States on December 6, 2025 by ELG1944
Fast acting weed and grass killer
The grass and weed killer works pretty good. But it helps to make it a little stronger then listed. There is also no odor to it. So far, it is better than most that I have tried.
Reviewed in the United States on August 29, 2025 by NICK S.
Effective vegetation killer at a reasonable price.
Product works well provided we follow the instructions correctly. For tougher weeds we may need to use more concentrated solution. It did not seem to work for bamboo shoots. Perhaps I may need to apply it several times.
Reviewed in the United States on April 17, 2025 by Cucullatum
grass and weed killer
great product good value
Reviewed in the United States on March 22, 2026 by ben rhodes
Not usable in Johnson grass not working
Live in south Texas specifically looking to kill Johnson grass among all other grasses and weeds unwanted. Used directions and used it three times. In the same area to no avail. Didn’t even change color!!!! It has been 4 hot scorching days in the triple digits but nothing happened
Reviewed in the United States on July 20, 2025 by Perfect condition strong material
Works OK but it is Not Fast Acting
After 3 days the Weeds show signs of dying, I have previously used RM43 however it can kill trees of it gets onto their roots. RM 43 works faster and better than RM18 Amazon's OVERALL PICK is Spectracide. Spectracide works much Faster than RM18.
Reviewed in the United States on August 8, 2025 by J.Scott 6
So disappointed So disappointed
It's been three and a half hours so far so I will definitely update tomorrow morning and again in a week. But so far feeling super disappointed. There was a guarantee that this product would start to show visible results within hours however if anything my weeds seem to be looking healthier than they did before I sprayed the product. I am only comparing this to the vinegar and soap solution that I used about a month ago which began wilting the weeds within 2 hours and killing them off completely where I had sprayed within 2 weeks. The only reason I decided to use this product is because after research there was a lot of good reports on it that it works and with the vinegar I had to buy at least six bottles and a large bottle of dish soap in order to cover my large yard which has just gone rampant with weeds since I got sick and have not been able to keep up with it like I used to. Now that I'm better and trying to recover myself and my beautiful garden and yard there's a lot of catch up to do. Since this seemed to cover a lot more area with a smaller amount I thought I'd give it a try. Again I will update tomorrow and again in a week but I wanted to show the results at different time periods as I go. Hopefully I will see some results in the next 12 hours. If still no results in a week I will be returning this product unfortunately.
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Reviewed in the United States on June 10, 2024 Reviewed in the United States on June 10, 2024 by Shaylin