0 s ▁Mal ay al am - language ▁films <0x0A> </s> ▁Cast ane a ▁c ren ata , ▁known ▁as ▁Korean ▁ch est nut , ▁Korean ▁cast ane a , ▁and ▁Japanese ▁ch est nut , ▁is ▁a ▁species ▁of ▁ch est nut ▁originally ▁native ▁to ▁Japan ▁and ▁South ▁Korea . ▁It ▁is ▁a ▁small ▁to ▁medium - s ized ▁decid uous ▁tree ▁growing ▁to ▁ 1 0 – 1 5 ▁m ▁tall . ▁The ▁leaves ▁are ▁similar ▁to ▁those ▁of ▁the ▁sweet ▁ch est nut , ▁though ▁usually ▁a ▁little ▁smaller , ▁ 8 – 1 9   cm ▁long ▁and ▁ 3 – 5   cm ▁broad . ▁The ▁flowers ▁of ▁both ▁sex es ▁are ▁bor ne ▁in ▁ 7 – 2 0   cm ▁long , ▁u pr ight ▁cat kins , ▁the ▁male ▁flowers ▁in ▁the ▁upper ▁part ▁and ▁female ▁flowers ▁in ▁the ▁lower ▁part . ▁They ▁appear ▁in ▁summer , ▁and ▁by ▁aut umn , ▁the ▁female ▁flowers ▁develop ▁into ▁sp iny ▁cup ules ▁containing ▁ 3 – 7 ▁brown ish ▁n uts ▁that ▁are ▁shed ▁during ▁October . ▁ ▁Cult iv ation ▁and ▁uses ▁It ▁is ▁an ▁important ▁tree ▁in ▁Japan ▁for ▁its ▁heavy ▁production ▁of ▁sweet , ▁ed ible ▁n uts . ▁A ▁number ▁of ▁cultiv ars ▁have ▁been ▁selected ▁for ▁large ▁nut ▁size . ▁It ▁is ▁also ▁widely ▁cultiv ated ▁in ▁eastern ▁China ▁and ▁Taiwan . ▁ ▁It ▁is ▁resist ant ▁to ▁ch est nut ▁bl ight , ▁and ▁is ▁of ▁importance ▁in ▁North ▁America