In order to investigate the effect of planting pattern on weed density and diversity and some characteristics of black cumin (Bunium persicum L.), an experiment was conducted at Agricultural Research Station, Ferdowsi University of Mashhad, Iran, during 2011-2012. In this study, weed density, weed Shannon index, Caraway height, crown diameter and soil coverage percentage were measured on 3 years Caraway field in random and row planting patterns. The results indicated that Height, crown diameter, soil coverage percentage, umbels per plant, umbelets per umbel and 1000-seed weight of black cumin, in row planting pattern were more than random planting pattern. Also, negative significant correlation was observed between total density of black cumin with total density and Shannon index of weeds.

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