Many rural users grow their own, effectively for free and many share their harvests with friends. Sowing and harvesting often take place during hiking trips. Hemp seeds are imported from the Netherlands, from Canada and from most marijuana growing countries. Hemp and marijuana grow well, from Okinawa to Hokkaido. There's plenty of rainfall and the cooler climate of the mountains is no problem, as marijuana also thrives in the mountains of Colombia, Mexico, Nepal and Switzerland.
People grow it on wooded hillsides, in abandoned fields, hidden in bamboo or goldenrod.
Increasingly marijuana is also cultivated at home, even in cities. Many Japanese growers read sophisticated foreign literature about growing indors under lamps. The information is freely available in numerous books and websites . Electricity may be expensive in Japan, but so is weed if it's purchased on the black market. Most of the home cultivated drug hemp is never sold.