Aboveground biomass production dynamics of the population Carex pilosa was investigated at the Ecological Experimental Station (EES) Kremnicke vrchy Mts, in 1994 within the research on population biology of plant species of the herb layer in ass. Carici pilosae-Fagetum O b e r d. 1957. The aboveground biomass in dry weight was the highest in September (414.30 kg.ha-1) and the lowest one in May (176.50 kg.ha-1) in juvenile individuals. The annual increment (C-production) of aboveground biomass in dry weight was 239.80 kg.ha-1.year-1. The relative growth rate (RGR in %) of the aboveground dry weight of individual Carex pilosa was the greatest in the V.-VI. month (32.13 %) and the smallest one in the IX.-X. month (-3.92 %).