There are some growing pains in switching from conventional grape growing to certified organic farming. Many top wine producers choose to farm sustainably but they either don't want to commit to the three year transitional period to be come certified organic, or they want to keep their options open. In some cases, wines are referred to as organically grown or made with sustainably farmed grapes. Neither of these would be considered certified organic wines even though they may have been farmed organically. They may contain added sulfites (which is a no-no if you want to be certified organic) or they may use practices in the winemaking process that are not allowed in certified organic wines.