85 Days to maturity (from transplant). Solanum lycoperscium. San Marzano Indeterminate (Organic) Tomato Seeds. Non-GMO, annual, open-pollinated, organic, heirloom, indeterminate, paste tomato. Often compared to the famous Roma tomato in terms of shape, size, and flavor, San Marzano seeds grow a traditional Italian cultivar commercially produced throughout the 20th century. Introduced in 1926, the San Marzano seed has become an Italian staple where it is known locally in Valle del Sarno as Pomodoro San Marzano dell'Agro Sarnese-Nocerino. ~7,500 seeds/oz.