Data was collected in the Main Experiment. Empty cells represent missing values that result from the design of the experiment. Empty cells result when the respective value does not occur in the design and could thus not be measured. For example, in the case of species-specific biomass cells are left blank, when the species was not sown in the respective plot.This datasets is part of a time series analysis about abundance and species richness of flower visitors, flower trait functional diversity and flower trait community in the Main Experiment since 2002 (doi:10.1594/PANGAEA.869777).