To be certified organic, wine must be made from organic grapes such that no synthetic chemicals are used at any stage of the grape growing or winemaking process. Only natural sprays in the vineyard are used, and often there are limits on how much of these may be used.
More importantly, the wines taste better. This is because natural methods of maintaining soil fertility are used and confer better balance in the grapes grown. This makes the wine making easier, so that less handling is needed in the winery, therefore the natural berry flavour is preserved.
Synthetic pesticides, herbicides, fungicides and fertiliser are well documented to degrade the environment, including biota, micro biota and soil structure. We don’t use any of these and we actively improve our environment both by soil amendments and biodiversity.