A method and a system for increasing the degree days in the immediate environment of fruit bearing vines for the cultivation of particular fruit bearing vines, such as non-rustic vinifera variety vines, in unfavourable climatic regions where the degree days is insufficient for the full maturity of the fruit, is described. Rows of the vines are protected in removable shelters which have a removable tarp cover disposed over a support frame structure to shield the rows of vines from the harsh, vine damaging, winter month temperatures while keeping the vines in a controlled temperature environment. Heated liquid circulation conduits are supported in the shelters at predetermined locations and provide controlled heat during the winter months to prevent the vines and the cordon bearing spuds of the vines from damaging cold temperatures. In the early spring the roots are activated early and the tarp is removed and a transparent film sheet covering is substituted to admit sunlight to help activate the vine early to g
