Ortho Weed & Grass Killer 1 Gallon

Fast-acting weed control that shows results in 15 minutes. That’s what Ortho Weed & Grass Killer delivers with its diquat-based formula. This battery-powered RTU sprayer handles spot treatments around patios, walkways, and gravel beds where you need vegetation gone today, not next week.

Skip it if you’re treating lawns. This is a non-selective herbicide that kills all plants contacted. The “GroundClear” branding tells you everything — it’s for clearing ground, not selective weed control. With 350 square feet of coverage per gallon, it works for hardscape edges and small problem areas. Not for broadcast applications.

The 15-Minute Promise

Diquat dibromide at 0.20% concentration drives the fast burn-down. Users report visible weed wilting within hours, but Ortho’s claim of 15-minute visible results holds up for contact action on green tissue. The rainfast in 15 minutes feature matters in Montana’s unpredictable spring weather — get it down between thunderstorms and you’re covered.

The three-way herbicide blend targets different plant systems. Fluazifop-P-Butyl (0.07%) hits grasses specifically, while dicamba dimethylamine salt (0.05%) provides systemic action on broadleaves. That systemic component is what kills weeds to the root so they don’t come back. Diquat alone just burns tops.

Active Ingredient	Concentration	Target	Action Type
Diquat dibromide	0.20%	All vegetation	Contact
Fluazifop-P-Butyl	0.07%	Grasses	Systemic
Dicamba, Dimethylamine salt	0.05%	Broadleaves	Systemic

Battery-Powered Application

The battery-powered Comfort Wand changes the game for spot treatments. One-touch continuous spray reduces hand fatigue compared to pump-up sprayers. Duracell batteries usually included, though some reviews mention battery failures in the wand as a weak point.

Setup takes seconds. Unfold wand until it clicks, activate batteries, insert hose connector to cap. No mixing. No measuring. No pumping. The 1-gallon (128 fl. oz.) ready-to-use formulation means you’re spraying within a minute of opening the box.

Weight runs approximately 8-9 pounds for the RTU gallon — manageable for extended spot-spray sessions. The wand extends your reach without bending, which matters when you’re working fence lines or building perimeters.

Real-World Performance

Home Depot shows 4.2 stars from 2,124 reviews. Common praise includes fast action with results often in 1 hour, the easy-to-use battery wand, and effective root-kill on tough weeds. Complaints center on battery wand failures and inconsistent results on mature weeds.

Target areas include patios, walkways, driveways, gravel and mulch beds, along fences, around buildings, and under trees and shrubs. That’s the sweet spot — hardscape edges where overspray won’t damage desirable plants. Works on all types of weeds and grasses, including clover, dandelion, oxalis, chickweed, and crabgrass.

Temperature matters. Apply when temperature is above 60°F — that’s late May through September for most Montana valleys. Apply when weeds are small and actively growing for best results. Mature, drought-stressed weeds resist herbicides.

Is It Worth It?

For contractors handling hardscape maintenance, yes. The time savings justify the premium over pump sprayers. Visible results in 15 minutes means you can treat and move on. The battery wand eliminates the repetitive pumping that wears out crews.

For homeowners with gravel driveways or extensive hardscaping, it’s efficient spot control. The non-selective action means careful application, but that’s what the wand design enables. You’re paying for convenience and speed.

Skip it for lawn renovation or large-area vegetation removal. For large areas, Ortho’s concentrate version covers 2,240 square feet when diluted — better economics for big jobs.

FAQ

Does this kill grass permanently? Yes, this kills weeds and grasses to the root. It’s a non-selective herbicide designed for total vegetation control, not selective weed removal from lawns.

How fast does it really work? Visible results appear in 15 minutes as plant tissue begins breaking down. Full kill typically occurs within 1 hour to a few days depending on weed type and growing conditions.

What’s the coverage per gallon? One gallon covers 350 square feet. That’s enough for typical residential hardscape edges but not economical for large areas.

Can this be used before rain? The formula becomes rainfast in 15 minutes after application. Apply when rain is not predicted for 24 hours for best results, though the 15-minute rainfast window provides flexibility.

What about the organic version? Ortho GroundClear Weed & Grass Killer OMRI Listed version uses a contact-kill organic formula. The standard version reviewed here is not OMRI listed.