Vallado's Douro Superior property at Castelo Melhor has 35-plus hectares of organic vineyards, certified organic in February 2015 with effect from 2012.
Tip: The Quinta do Orgal Organic Vineyards bottling is the estate's certified-organic Douro Superior red; look for it specifically.
Address: Castelo Melhor, 5150 Vila Nova de Foz Coa, Portugal, Douro Valley
The Bouchard family's 18th-century estate at the meeting of the Tedo and Douro rivers grows organic grapes and runs hands-on harvest foot-treading experiences.
Tip: Combine an organic-estate visit with a September lagar foot-treading session; the family welcomes guests into the harvest.
Niepoort owns 60-plus hectares in the Douro farmed organically since 1999, many parcels certified organic, with low-intervention winemaking on old-vine field blends.
Tip: Many but not all Niepoort parcels are certified; the Bioma and Redoma bottlings come from the organic core of the estate.
Tiago Sampaio makes the Uivo wines from high-altitude vines near Alijo with no added yeast, no fining and no filtration, a benchmark for natural wine in the Douro.
Tip: The Uivo range, from skin-contact whites to the Renegado field blend, is the place to start with natural Douro wine.
Several Quinta do Crasto wines, including the Crasto red, the Superior Branco and the old-vine reservas, are made without animal-derived fining and are certified vegan.
Tip: Crasto does not hold organic certification, but its core reds and whites are vegan-friendly; check the back label for the vegan mark.
Niepoort's Redoma Tinto is an organic, unfined and unfiltered Douro red made without animal-derived fining and marked vegan.
Tip: Redoma comes in red, white and rose; the unfined, unfiltered reds are the clearest expression of Niepoort's vegan, low-intervention approach.
Tiago Sampaio bottles the Uivo wines with very low sulfites, around 20 ppm total for the whites, with no fining and no filtration, among the lowest in the Douro.
Tip: Because sulfites are so low, store and serve these wines cool; they reward fresh, prompt drinking.
