Due in part to the fact that the Toyohira district (formerly Toyohira-cho - Hiroshima Prefecture) of Kitahiroshima-cho had the proper conditions to grow buckwheat, the crop descended from the Izumi soba buckwheat was cultivated on the small scale.
北広島町豊平地区（旧豊平町(広島県)）は、ソバ栽培に適した条件が整っていたこともあり出雲そばの流れを汲んだそばが細々と作られていた。