This study was carried out to determine the effects of cumin and fennel seeds extracts, on the germination, seedlingdevelopment and mitotic activity in root end meristem cells of flax seed. The experiment was established in laboratoryaccording to randomized plot factorial experiment design with three replications in incubator having 23 ℃ temperature.At the end of 14 days of germination period some germination parameters were measured. According to the control, itwas observed that fennel extract applications positively affected the germination and seedling development of flax seedexcept 100 g/l dose. While germination is seen at 100 g/l, seedling growth is completely prevented. It was observed thatall cumin extract applications had a negative effect on the germination and seedling development of flax seed comparedto the control. This negativity has shown more effect in increasing doses. While the germination rate is graduallydecreasing in increasing doses, it is observed that the growth of seedlings is completely prevented except 12.5 and 25g/l cumin extract. Increased doses at doses other than 100 g/l increased the mitotic index in fennel extract applicationand decreased the dose increase in cumin extract application. The percentage of chromosomal abnormality decreased inparallel with the increase in doses other than 100 g/l in fennel, but percentage of chromosomal abnormality increase withincreasing doses in cumin extract. During mitotic examinations; mitotic abnormalities such as failure to collect themetaphase plate, bridge in anaphase and telophase were observed and their pictures were recorded.