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Field margin plots, sown with either a simple grass mix, a complex grass mix with or without forbs or allowed to regenerate naturally were established around four fields on the Royal Agricultural College’s Harnhill farm in the west of England. Two of the fields were managed conventionally and two were managed organically. Plants and invertebrates were recorded on the margin plots over a 2 year period to test the influence of the different mixtures on the community assemblages. There was no difference in the seed bank of the different plot types, however the organically managed margins contained more unsown species than the conventionally managed margins. The simple mix plots had significantly fewer plant species than the other plots. The naturally regenerating plots had significantly lower grass cover and grass species diversity than the other plots. In the second year perennial grass and perennial forb …