The main cultivated variety is the Bianchera - Belica (Slovenian name for the cultivar), selected over the centuries in the territory of the municipality of San Dorligo della Valle - Dolina. Its name probably derives from the fact that the color change of the fruit (veraison) is late and progressive, and almost never complete even at advanced ripening.
It lives well on the marly-arenaceous hills that surround the Gulf of Trieste, but also on the best exposed limestone soils of the Karst plateau. Among the main agronomic characteristics of this autochthonous variety is a high resistance to cold temperatures. Oil production is high, and yields are generally above 16%. The bianchera oil has some characteristic and very important aspects: a high percentage of oleic acid and a high content in polyphenols, natural antioxidants, as well as an extremely low oleic acidity.