How much does the quality of the grape matter versus the environment where the vines are? The environment and quality of grape are not independent variables. Typically you will not get a good quality grape from a bad environment. There are many factors in the environment. For example, there is a daytime temperature and a nighttime temperature. The interaction between those two things develops flavors and you need the right combination. A grape might look good growing in a bad environment, but it won't taste good.