This page contains affiliate links. If you buy through them, we may earn a commission at no extra cost to you.
Coastal Picks
Roundup Weed & Grass Killer4 review
A non-selective weed and grass killer built to clear vegetation to the root, with a hands-free Comfort Wand applicator.
Quick take
This formula kills tough weeds and grasses down to the root, including dandelion and other common invasive plants. It's rainproof in as fast as 30 minutes, shows visible results within hours, and allows replanting 1 to 30 days after application depending on the plant (see the product booklet for specifics). It's suited for flower beds, around trees and shrubs, patios, and walkways, and the Comfort Wand applicator offers one-touch continuous spray.
From our own use
Roundup offers products for different applications. I use a selective weed killer on the lawn and reserve this broader weed-and-grass killer for beds or other areas where I want to remove all vegetation. Reading the label carefully is important because the wrong product can damage desirable grass or plants.
| Brand | Roundup |
| Form | Liquid |
| Volume | 1.33 gallons |
| Weight | 13.6 lbs |
| Rainproof timing | As fast as 30 minutes |
| Replanting window | 1-30 days after application, plant-dependent |
Who it's for
Good fit
- Clearing weeds and grass in beds, walkways, or patios where you want all vegetation gone
- Anyone wanting fast, visible results and quick rainproofing
- People who want a hands-free spray wand for larger areas
Skip it if
- You want to protect existing lawn grass — this is non-selective and will kill grass, not just weeds
How it's used
The key distinction from a selective lawn herbicide is that this kills everything green it touches, which is exactly the point for beds, walkways, and areas where total clearing is the goal — not for use on a lawn you want to keep. The Comfort Wand's one-touch continuous spray is built specifically to reduce hand fatigue over larger treatment areas.
Pros and cons
Pros
- Kills weeds and grass to the root
- Rainproof in as fast as 30 minutes
- Visible results within hours
- Comfort Wand reduces hand fatigue during application
Cons
- Non-selective — will kill desirable grass and plants too
- Requires careful label reading to avoid damaging areas you want to keep
Frequently asked questions
Will this kill my lawn grass too?
Yes — this is a non-selective killer, meaning it kills grass along with weeds. Use a selective lawn herbicide instead if you want to protect your lawn.
How fast does it work?
Visible results appear within hours, and it's rainproof in as fast as 30 minutes.
When can I replant after using it?
Between 1 and 30 days, depending on the plant — check the product booklet for specifics.
What areas is it recommended for?
Flower beds, around trees and shrubs, patios, walkways, and similar non-lawn areas.