Foxtail: identify it, treat it, keep it out

Foxtail runs the same annual playbook as crabgrass: spring germination once soil warms, fast summer growth in any thin or disturbed spot, heavy seed drop, death at frost. It tends to start a week or two after crabgrass and stands more upright, which is why the two are easy to confuse until the unmistakable bottlebrush seed head appears in midsummer. Everything that prevents crabgrass prevents foxtail, on the same calendar.

The one difference that matters is the seed head itself. Each awn is barbed like a fishhook, and once mature they detach and work their way into dog paws, ears, and noses, sometimes migrating deep enough to need a vet. If you have dogs, foxtail is not a cosmetic weed. Mow seed heads off before they brown, and clear plants along fence lines and paths where dogs run.

Foxtail flags compacted and newly disturbed ground: construction edges, dog runs, the strip where cars cut the corner. Core aerate those areas in the appropriate season, then get grass established before the next spring flush, because bare, hard soil in June is a foxtail invitation.

Chemically, one spring pre-emergent at the crabgrass trigger (soil holding about 55°F) covers both weeds, with a half-rate follow-up 6 to 8 weeks later where pressure is heavy. Spot-treat young escapes with quinclorac. Once a plant has seeded out in late summer, spraying buys nothing: frost will kill it, and your job becomes catching next year's generation at the barrier.