▁ 1 8 1 5 , ▁many ▁cast les ▁were ▁re built . ▁ ▁Vit icult ure ▁▁ ▁The ▁Middle ▁Rh ine ▁ge ographical ▁region ▁is ▁largely ▁identical ▁to ▁the ▁ge ographical ▁region ▁to ▁the ▁Middle ▁Rh ine ▁wine ▁region , ▁as ▁defined ▁by ▁the ▁German ▁wine ▁law ▁as ▁a ▁specified ▁area ▁for ▁quality ▁wine . ▁ ▁The ▁Rom ans ▁introduced ▁vit icult ure ▁into ▁the ▁Region . ▁ ▁That ▁is , ▁they ▁introduced ▁it ▁into ▁the ▁Mos elle ▁valley ; ▁it ▁spread ▁into ▁the ▁Middle ▁Rh ine ▁Valley ▁during ▁the ▁Middle ▁A ges . ▁ ▁This ▁development ▁took ▁place ▁in ▁four ▁phases ▁from ▁the ▁ 1 1 th ▁to ▁the ▁end ▁of ▁the ▁ 1 4 th ▁century . ▁ ▁An ▁essential ▁element ▁of ▁this ▁development ▁was ▁the ▁new ▁technique ▁of ▁terra ce ▁vit icult ure . ▁ ▁V ines ▁are ▁grown ▁on ▁terra ces ▁s lop ing ▁from ▁ 2 5 ° ▁to ▁ 3 0 ° ▁and ▁more . ▁ ▁The ▁climate ▁fav ored ▁wine ▁Production . ▁ ▁The ▁Rh ine ▁and ▁the ▁sl ate ▁and ▁gre yw ack e ▁weather ed ▁so ils ▁function ▁as ▁a ▁heat ▁storage ▁to ▁prevent ▁large ▁temperature ▁fl uct u ations . ▁ ▁Additionally , ▁the ▁ste ep ▁s lop es ▁function ▁to ▁d rain ▁cold ▁air ▁from ▁the ▁valley . ▁ ▁This ▁is ▁particularly ▁benef icial ▁for ▁the ▁late - ri pen ing ▁R ies ling , ▁which ▁is ▁grown ▁on ▁about ▁ 6 8 % ▁( stand ▁ 2 0 1 3