What Herbicide Kills Foxtail but Not Grass | Selective Control That Works

Fenoxaprop-p-ethyl, quinclorac, and topramezone are the main selective postemergence options that kill foxtail without killing labeled turfgrasses, while prodiamine, pendimethalin, and dithiopyr prevent it before germination.

Foxtail appears as a clumpy, seed-headed grass unlike surrounding turf, and pulling only works while young. Certain herbicides target annual grasses like foxtail while leaving desirable grass alive—that gap is what selectivity exploits. Which product works depends on turf species, foxtail species, and whether the weed has emerged.

What Does “Selective” Mean for Foxtail?

Selective herbicides exploit biological differences between weed and turf; label-approved rates and timing keep desirable grass safe. Safety depends on turf species, cultivar, growth stage, temperature, rate, and label directions. Preemergence herbicides (prodiamine, pendimethalin, dithiopyr) work in soil and stop susceptible seedlings from establishing, but generally do not remove mature foxtail. Postemergence herbicides are absorbed by actively growing foliage, so they work best while the plant is young. The same chemical can injure desirable grasses if used on unlisted species, at excessive rates, during heat or drought stress, or under prohibited conditions. Penn State lists green and yellow foxtail as targets for these active ingredients. Confirm your turfgrass is on the label before spraying.

Preemergence vs. Postemergence Foxtail Herbicides

Timing decides the category: before germination, use preemergence; if visible, use postemergence while small.

To compare ready-made options, this roundup of the best herbicide for foxtail covers tested picks for common lawn situations.

Application Without Damaging Your Lawn

1. Identify foxtail and turfgrass, then confirm both appear on the label.
2. For prevention, apply prodiamine, pendimethalin, or dithiopyr in spring before germination at exact label rate with required irrigation or incorporation.
3. For emerged foxtail, apply a labeled postemergence product while plants are young (early growth or 1–4 inches tall).
5. Do not mow two days before or after quinclorac 4L application; leave clippings from the first three mowings on the treated area.
6. For granular products, use a calibrated spreader and avoid skips and overlaps.

Success means the spray dries and foxtail stops growing; expect yellowing, twisting, and no new leaves within one to two weeks, depending on temperature and growth stage.

The label is legally controlling and outranks any summary. Quinclorac products may restrict turf type, timing, adjuvants, mowing, irrigation, reseeding, and nearby ornamentals; the EPA-approved quinclorac 4L turf label controls over retailer directions. Fluazifop-P-butyl products are postemergence grass herbicides for ornamentals and certain turf grasses, but the cited label does not establish universal safety—use only on listed sites and species. Virginia Cooperative Extension identifies pendimethalin and quinclorac for annual foxtails in pastures and hayfields, but states no selective herbicides control established perennial grasses in cool-season grass forages. Wear required PPE, observe restricted-entry directions, prevent drift, protect water and desirable plants, and follow the complete EPA label.