Autumn in the Vineyard

The novel the film is based on is actually the third book in a series entitled St Helena Vineyards. The sequel film Summer in the Vineyard (2017), is based on the second book.

Gabe and Frankie decide to have a contest for ownership of the winery with the winner being the one who brings in the most grapes. The reality is that in quality winemaking a low yield is preferable - the energy of the vines are spread through fewer grape clusters. You also want smaller berry size so that the ratio of pulp to skin surface is as low as possible. And you want to use very little water. Overwatering creates plump, tasteless grapes with lower sugar and acid.

Followed by Summer in the Vineyard (2017)