Best Weed Killers for Lawns That Will Not Kill Grass (2026)

Selective herbicides exploit differences between weeds and grass. Broadleaf products (often combinations of 2,4-D, dicamba, MCPP, triclopyr or similar actives) disrupt growth in broadleaf plants such as dandelion and clover but are tolerated by listed turfgrasses. Grassy-weed products such as quinclorac target crabgrass and foxtail while sparing listed turf. Non-selective products such as glyphosate have no such filter.

"Selective" always comes with conditions: the right grass type, the label rate, and temperature limits. Ortho's label, for example, says to apply to actively growing weeds when daytime temperatures are below 90 F. Heat, drought-stressed turf, or doubling the rate can injure even tolerant grasses. The pre-emergent vs post-emergent comparison covers the other axis: preventing seeds versus killing plants you can see.

Read the "use on" and "do not use on" lists before buying. St. Augustinegrass and centipedegrass are the most common casualties: many 2,4-D products, including many weed and feeds, can injure them. Scotts Weed and Feed5 excludes St. Augustine (including Floratam), carpetgrass, bentgrass, dichondra and lippia. Ortho WeedClear lists St. Augustine but not the Floratam variety. When a label says a grass is not listed, treat that as a no.

Perennial broadleaf weeds are easiest to kill in fall, when they move sugars down to their roots and carry herbicide with them. Annual weeds are easiest to kill young. See creeping Charlie and white clover for weed-specific plans.

Honest answer: there is no natural spray that reliably kills weeds in a lawn without also damaging the grass. Vinegar-based products, including 20 percent horticultural vinegar such as Green Gobbler 20 percent vinegar, are non-selective contact burners. They brown whatever leaf they touch, grass included, and perennial weeds like dandelion usually regrow from the root. Concentrated acetic acid can also burn skin and eyes, so it needs gloves and eye protection. Salt and boiling water are also non-selective, and salt can sterilize soil.

The closest thing to a gentler selective option is chelated iron (FeHEDTA) broadleaf products, sold as iron-based lawn weed killers, which extension trials show can suppress some broadleaf weeds such as clover and dandelion but usually need repeat applications. Corn gluten meal is sold as a natural pre-emergent, but university research results have been inconsistent. The most reliable "natural" control is a thick lawn: mow at the high end of your grass's range (see the mowing height chart), feed at the right time, and overseed thin areas so weeds have no room.

For spot treatments, a 2 gallon handheld such as the Chapin 16200 is enough. For whole-lawn broadleaf treatments on a quarter to half acre, a 4 gallon backpack or the battery-powered M4 backpack ($249.99) keeps pressure steady. On an acre or more, a tow-behind boom sprayer such as the Agri-Fab 15 gallon pulled by a lawn tractor applies an even rate far faster than walking. Keep a dedicated sprayer for herbicides and never use it for anything else. The best lawn sprayers roundup covers calibration, and the expert 1 acre lawn setup shows how a tow sprayer fits alongside the mower and spreader.