Little Barley

Little barley (Hordeum pusillum) is a winter annual grass that germinates in fall, overwinters as small rosettes, bolts in early spring with distinctive wheat-like seed heads, and dies back completely by May or June. Most homeowners never notice it until April or May, when every driveway edge and south-facing lawn border has a three-week burst of tan-colored seed heads that look like miniature barley — because that's exactly what they are.

Little barley is a driveway-edge and hardscape-adjacent weed. I rarely see it taking over the middle of a well-maintained fescue lawn. It concentrates where the soil is compacted, hot, and low on fertility — driveway borders, sidewalks, boulevard strips, sunny fencelines, and the gravel-contaminated strips that new construction leaves behind. Dense fescue crowds it out before the seed can germinate in those interior areas.

Control is timing-dependent. By the time you see the seed heads in April, the plant has already completed its reproductive cycle and new seed is dropping. Spraying at that point is pointless — it's about to die on its own. The effective window is a pre-emergent in early fall, applied to the hardscape edges where you know it comes back year after year. Dithiopyr and prodiamine both work. Post-emergent control during the growing season is possible with quinclorac or similar grass-active products, but the better move is shifting the fertility and overseeding density so fescue outcompetes it in those edge zones. A thick fescue lawn is the cheapest pre-emergent there is.