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<i>Vulpia myuros</i> has become an increasing weed problem in winter cereals in Northern Europe. However, the information about <i>V. myuros</i> and its behavior as an arable weed is limited. Field and greenhouse experiments were conducted in 2017/18 and 2018/19, at the Department of Agroecology in Flakkebjerg, Denmark to investigate the emergence, phenological development and growth characteristics of <i>V. myuros</i> in monoculture and in mixture with winter wheat, in comparison to <i>Apera spica-venti</i>, <i>Alopecurus myosuroides</i> and <i>Lolium multiflorum</i>. <i>V. myuros</i> emerged earlier than <i>A. myosuroides</i> and <i>A. spica-venti</i> but later than <i>L. multiflorum.</i> Significant differences in phenological development were recorded among the species. Overall phenology of <i>V. myuros</i> was more similar to that of <i>L. multiflorum</i> than to <i>A. myosuroides</i> and <i>A. spica-venti</i>. <i>V. myuros</i> started seed shedding earlier <i>than A. spica-venti</i> and <i>L. multiflorum</i> but later than <i>A. myosuroides</i>. <i>V. myuros</i> was more sensitive to winter wheat competition in terms of biomass production and fecundity than the other species. Using a target-neighborhood design, responses of <i>V. myuros</i> and <i>A. spica-venti</i> to the increasing density of winter wheat were quantified. At early growth stages “BBCH 26–29”, <i>V. myuros</i> was suppressed less than <i>A. spica-venti</i> by winter wheat, while opposite responses were seen at later growth stages “BBCH 39–47” and “BBCH 81–90”. No significant differences in fecundity characteristics were observed between the two species in response to increasing winter wheat density. The information on the behavior of <i>V. myuros</i> gathered by the current study can support the development of effective integrated weed management strategies for <i>V. myuros</i>.