Differences between RM18 and RM43

The Main Differences Between RM18 and RM43

With the recent introduction of RM18 to our herbicide family, we’ve had a lot of people asking what makes it so special–and what makes it so different from the other effective weed-killers we offer, namely RM43.

Here’s what you need to know.


When you want to replant, use RM18.

RM18 was specifically designed for lawn replacements, garden bed prep, and clearing weeds from walkways, buildings, and roadsides. Its unique combination of two herbicides kills weeds and plants while leaving fertile soil untouched, making it ideal for lawn and landscape projects you can’t wait to tackle.


When you want to total vegetation control to bare ground, use RM43.

RM43, on the other hand, doesn’t mess around with weed control. It kills existing weeds down to the root and prevents regrowth for up to a year. Perfect for prepping asphalt driveways, patios, and tennis courts, RM43 will keep your new hardscape clear of weeds so you can enjoy it season after season. It’s also great for killing plants on a pretty permanent basis around your retaining walls, fence lines, and mailboxes.


The number is important.

The main difference between RM18 and RM43 is more than just a number, although it refers to the same chemical present in each–Glyphosate, isopropylamine salt. This widely used broad-spectrum systemic herbicide stops a specific enzyme process in plants, preventing them from creating certain proteins that are essential for growth. In the case of RM18 and RM43, their numbers refer to the percentage of glyphosate in their total mixture.


Think of it like this: RM43 is extended long term control, and RM18 is for a quick kill.

When it comes to choosing the right weed killer for the job, we usually recommend you work your way up the chain. You wouldn’t use a chainsaw to cut down a sapling, so don’t use the most powerful weedkiller on the market when RM18 works just as well. If you have additional questions, please read the product labels carefully before you start spraying. (This is the one for RM18, and here’s the one for RM43, for your reference).