Yellow Woodsorrel
Weeds
sour-grass, Oxalis europea, Ladies' Sorrel, Oxalis, woodsorrel
Oxalis stricta
Yellow woodsorrel is a common summer annual in cool-season turf. Yellow woodsorrel is one of the latest germinating summer annual weeds. Often, infestations of oxalis can be associated with spring-timed broadleaf weed control applications. The reason is that most spring-timed herbicide applications are applied before the oxalis has germinated. The result is that oxalis is perfectly suited to fill in all the voids left in your turf from where the broadleaf weeds were removed. Once established, oxalis can be difficult-to-control as summer conditions limit herbicide effectiveness.