Winter cereal rye (Secale cereale L.) can be used as an interseeded living mulch for integrated weed management in vegetables. Two aspects limit cereal rye living mulch utility: yield impeding crop interference and concurrent cereal rye and weed establishment. Micro-rates of quizalofop-p-ethyl herbicide applied postemergence limited cereal rye living mulch vigor via chemical mowing; the dose response depended upon rye stage at application. Chemical mowing failed to preserve snap bean yield and consistently limit weed biomass. Split and single quizalofop-p-ethyl application rates did not differ from the untreated rye control for weed control, snap bean yield, and cereal rye dry weight. Preemergence herbicide use could provide cereal rye with a temporal emergence advantage over annual weeds. Cereal rye tolerated the low-label rate of S-metolachlor, dimethenamid-p, pendimethalin, and EPTC applied preemergence. These results will inform the methodologies of future studies examining cereal rye living mulch use in vegetable systems.