Compare-N-Save 41% Glyphosate Grass & Weed Killer Concentrate Review (2026)
By Nate Sawyer, Editor · Updated July 2026
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- Large areas
- Perennial weeds
- Systemic kill
- Fence lines
A conventional, budget systemic herbicide for clearing large or perennial weed problems root-and-all — powerful but non-selective, so use PPE, follow the label, and consider lower-toxicity options for small jobs.
Pros
- Systemic action kills weeds down to the root, including tough perennials that vinegar only burns back
- Very economical — a small concentrate bottle makes many gallons of spray for large areas
- Rainproof within about 2 hours and effective on a broad range of weeds and grasses
Cons
- Non-selective — will kill any green plant it contacts, including lawn grass and garden plants
- Synthetic herbicide with label PPE and re-entry requirements; glyphosate is subject to ongoing health debate and some local restrictions — read the label and check local rules
- Can move within/through plants and requires care near desirable roots, water, and pollinator-visited blooms
Specifications
| Active | Glyphosate 41% (isopropylamine salt) |
|---|---|
| Organic | No — conventional synthetic herbicide |
| Targets | Broadleaf & grassy weeds, systemic (kills to the root) |
| Use on edibles | Non-selective; keep off crops and desirable plants — see label pre-plant intervals |
| Safety | Wear gloves/eye protection; keep off pollinator plants; keep pets/kids off until dry. Follow label & local rules |
Frequently Asked Questions
- How much spray does one bottle of Compare-N-Save make?
- A 32 oz concentrate makes roughly 21 gallons of spray, and a gallon of concentrate makes about 85 gallons. That is why it works out so economical for fence lines, gravel and large areas compared with ready-to-use bottles.
- Will Compare-N-Save kill weeds down to the root?
- Yes - at 41% glyphosate it is systemic, moving through the plant to kill the root, which is what separates it from contact burndown products that only scorch the tops. That is why it works on tough perennials that vinegar-based killers only knock back temporarily.
- Can you use it on a lawn?
- No, and this is the mistake to avoid. It is non-selective and will kill any green plant it contacts, including lawn grass and garden plants. It is for spot and area treatment where you want everything gone - driveways, fence lines, beds being cleared - not for weeding within turf.
- How soon is it rainproof, and what safety steps does it need?
- Rainproof within about 2 hours. On safety, follow the label rather than habit: wear gloves and eye protection, keep pets and children off treated areas until dry, and keep it off pollinator-visited blooms. It can also move within and through plants, so take care near the roots of desirable plants and near water.
- Is glyphosate safe to use?
- It is a conventional synthetic herbicide subject to ongoing public health debate and to local restrictions that vary by state and municipality. We are not going to resolve that debate for you - what we will say plainly is to read the product label, observe its PPE and re-entry requirements, and check your local rules before buying. If you would rather avoid glyphosate entirely, a 20% horticultural vinegar burndown is the common alternative, with the trade-off that it does not kill perennial roots.