Where & when was this culture practiced?
The culture of the samurai was practiced in feudal Japan. Samurai were found all across Japan.
Samurai culture first started in the late 12th century during the Kamakura period (1192-1333). This unique culture evolved over time throughout the various time periods in Japan.
During the Edo period (1603-1867), samurais were locked into their social standing and forced to work for the government or take up a trade because of the military dictatorship in order to freeze the social order and stabilize society. This was a 250 year period. Many Samurai lived on the allownce given by the government, the amount of which slowly decreased over time despite their social standing; many were in poverty by the end of the Edo period.
In 1871, samurai warriors lost their power along with the abolishment of feudalism in Japan.