From 2006, so many metapopulations of Primula sieboldii have been found around halfway up Mt. Haruna, Gunma Pref. The largest metapopulation was found in the artificial coniferous (mainly cedar) forests at the north face of the mountain.  This area, however, might be large grassland till the end of the World War II, and after that, cedar plantation was set over. There also be many metapopulations found at the western face of the mountain. This area might also be large grassland till the end of the World War II, and after that, it has been used as SATOYAMA. More than 8 large metapopulations have been monitored for about 8 years. Style analysis revealed that most of the metapopulations have about 1:1 pin/thrum ratio with 0％ to about 10% of homo style.　Seed production ratio (genet based) has been about 40％ to 60% independent of per cent homo style, the sites of metapopulations, and monitoring years. Pollen limitation, insect predation and fungal attack must be major factors for seed loss, and their impacts have been fluctuating over sites and years.