Everyone seems to define the new buzzwords "green wine" a bit differently. To some, organic is the key. To others, using primarily IPM (integrated pest management) and preserving local habitat. Some also count practices like not burning the vine clippings, powering vineyard equipment with biodiesel, and growing some varietals without irrigation. Like most products using the 'green' label in marketing, you really just have to ask the producer what they mean. In the case of Wolff Vineyards in San Luis Obispo, the answer gets quite lengthy, pairs well with amusing anecdotes, and comes with a palate cleanser of great views and fresh breezes.
The Wolff family's 125 acres of Edna Valley vines produce quite a variety of grapes, including two whites and several reds. None of the finished vines are mass produced, or marketed too far afield. The family of vinters prefer to have a small, loyal following of repeat customers.
While the 55 acres of dry-farmed chardonnay intrigued me the most, the family has been implementing a host of restorative practices on their land, well-summarized on their website. Getting the full story is just one good excuse to visit.