Posted by Drew. San Marzano. When our San Marzano tomatoes come to ripen in the warmth of late summer, everyone knows it time to get saucy. Depending on where you live in the world start sowing your tomato seeds late winter if you are planting in a greenhouse or early spring if you are growing them outdoors. San Marzano tomato plants reach maturity and begin to bear fruit within 85 to 90 days after seed germination. I started growing San Marzano tomatoes from seed in my kitchen a few months ago. There is no question about it - San Marzanos are quite simply the best saucing tomato you can choose. Tomato: Paste, Sauce & Plum. This articles explains step by step with pictures, how to grow san marzano tomatoes. If you like to preserve for winter, these would be good to grow in the garden. Purchase a plant from a garden center or start your tomatoes from seed about eight weeks before the last average frost in your area. Grow San Marzano Tomatoes From Seed. These have been bred to have more interior tomato flesh to bulk up a sauce derived from these types of fruit. San Marzano Tomato Care. The seedlings grew really well. Fertility. San Marzano tomatoes, which are a type of paste tomato, are known for their bright-red or golden-yellow fruits. Paste, Sauce & Plum bear elongated fruits which are lower in water content, and renowned for canning, making sauce or … This is an example of the timeline you would see based on your growing conditions. How to Harvest San Marzano Tomatoes. These are determinate plants yielding pulpy tomatoes in about 12 weeks time. San Marzano Tomatoes Time to Get Saucy! Common varieties – Roma, San Marzano, and Veeroma. Gently grab the fruit and twist it until the tomato pulls free from the stem. They emerged within the first week and all were quite strong, despite my lack of grow… I put the seeds in a seed tray of Seed Starting Mix Jiffy mix I got from Fred Meyer. San Marzano. The fruit will be a deep red in color and firm to the touch. It’s a good idea to start early if you live in a short season climate, as these tomatoes … San Marzano tomatoes are a heirloom variety of tomato well known for their usage in canning and sauce making. Read on for helpful tips on tomato care. Growing San Marzanos from seed takes a bit more effort but is worth doing as you can get more plants for your money. Tomatoes are heavy feeders, but be mindful of applying too much nitrogen.