Fritillaria meleagris L. is a rare species mainly associated with floodplain forests and meadows. Conservation of populations of this species needs to consider a key aspect of its life history – prolonged dormancy (PD). In F. meleagris, this was observed during 8-years monitoring of  individual plants on  the  protected ancient Lugg Meadow in the UK. One-year PD was most frequently observed in the population, followed by 2-year PD. Seven-year dormancy was the longest recorded. Twenty two percent of plants didn’t display PD during the observation period. Large variability in the patterns of individual plants submerging and re-emerging from dormancy in  different years, suggested individual genetic heterogeneity as  the  main factor driving PD of the species. Three morphological states were identified in dormant plants of  F.  meleagris including a  false dormancy in  individuals which carried on  growing below ground. Patterns of  PD in  rare species need to  be  studied on individually monitored plants and applied to models of population dynamics for species conservation purposes