In a one-year study in Northern Germany, we analyzed the effects of unsown fallow strips and landscape heterogeneity on the segetal flora of organically managed sandy fields. Diversity of plants was higher in two/three-year-old fallow strips compared to reference sites tilled with winter rye. Concerning endangered species, this effect was more pronounced in fields that were in a small-scale than in a homogenous landscape, as the latter possibly featured less colonization potential
