Not only do you get to know the age of your tomato plant, you'll know exactly how and where it was grown. There is no question about it - San Marzanos are quite simply the best saucing tomato you can choose. San Marzano Tomatoes Time to Get Saucy! San Marzano is a variety of plum tomato, with thinner, elongated and more pointed, meaty fruits than Roma tomatoes. Posted by Drew. Because of the close attention to quality, many cooks consider San Marzano tomatoes to be among the best in the world to use in a sauce. Harvesting tomatoes. In San Marzano, the tomato harvest begins in August and runs through September. If you are taking good care of your plants, then harvest should be bountiful. San Marzano's taste is stronger, sweeter and less acidic, considered by many people to … San Marzano has a unique characteristic. Fruits ripened that way are far more superior in taste and flavor. The crops are very delicate and all the tomatoes are picked by hand at the peak of their ripeness. How to Plant San Marzano Tomatoes. When our San Marzano tomatoes come to ripen in the warmth of late summer, everyone knows it time to get saucy. Here are just a few tips for starting your own San Marzano tomato plant: Start From Seeds: Though you can purchase young San Marzano plants from garden centers, growing your own from seed has much more to offer! The fruits automatically drop off to the floor when they are ripened enough. Harvesting the San Marzano, therefore, is an articulated process divided into 4 steps. I always let the fruits ripen on the plant. 4 steps, around 10 days each apart, to pick the vegetables from the base of the plants, where the tomato matures first because it is more at contact with the heat of the earth, and then slowly pick … San Marzano tomatoes are regulated and certified authentic by an independent third party, Agri-Cert, using the guidelines created to regulate San Marzano tomatoes in Italy. San Marzano Tomatoes - How to Grow and Care for San Marzanos.