Lokacin hunturu ne a arewacin Minnesota, kuma lokacin girma na waje ya daɗe. Amma bar shi ga 'yan Minnesota don ƙirƙira hanyar da za su shuka ganye a cikin hunturu ta amfani da kayan da za ku iya tashi a nan cikin sauƙi. Lumber, gilashi, manyan duwatsu, datti, da hasken rana shine duk abin da kuke buƙata don Gidan Ganyen Ruwa mai zurfi.
Deep Winter Greenhouse (DWG) ya bi ta da yawa sake zane, amma duk ya fara da wani littafi Carol Ford da Chuck Waibel a 2009 mai suna The Northlands Winter Greenhouse Manual. Sun zauna a Chippewa County, Minnesota, sa'o'i da yawa kudu da nan, amma ra'ayin ya kama tare da masu noma a arewa mai nisa ma.
Don haka, menene DWG? Wuri ne mai ɗorewa na hasken rana wanda ke ɗaukar hasken rana da zafin rana da rana kuma yana adana zafinsa a cikin ƙasa don sake zagayawa da dare. Gidan greenhouse yana fuskantar gabas-yamma tare da babban gilashin kudu mai fuskantar kudu ko bangon polycarbonate wanda aka gina a kusurwa wanda zai iya kama yawancin kuzarin rana gwargwadon iko, idan aka ba da latitude. Sauran ganuwar suna da ƙarfi kuma suna da kyau sosai, sau da yawa tare da filaye na ciki masu haske, kuma bangon arewa wani lokaci yana zama mafakar ƙasa, idan yanayin shimfidar wuri ya ba da izini. Datti ne, da kuma wani lokacin tsakuwa ko manyan duwatsu masu zurfin ƙafa huɗu a ƙarƙashin gidan greenhouse, waɗanda ke aiki azaman baturi don adana zafin da aka kama da rana. Ana hura wannan zafi a ƙarƙashin ƙasa tare da fanka sannan a fitar da shi zuwa cikin yankin da ake girma da daddare.
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