San Marzano tomatoes are a variety of plum tomatoes that are prized for their rich flavor, meaty texture, and low acidity. They are considered one of the best tomatoes for making sauces, pastes, and canning due to their high solids content and intense flavor.

San Marzano tomatoes originated in the San Marzano sul Sarno region of Italy, near Naples. They are a type of plum tomato, known scientifically as Solanum lycopersicum, and belong to the Solanaceae family. Traditionally, San Marzano tomatoes are grown in the volcanic soil of the Campania region, which is believed to contribute to their unique flavor profile.

Growth Habits: San Marzano tomato plants are indeterminate, meaning they continue to grow and produce fruit throughout the growing season until frost kills the plant. They typically reach heights of 1.2 to 1.8 meters and require staking or support to keep the heavy fruit off the ground. The fruits are elongated and pointed, with thick flesh and few seeds. San Marzano tomatoes are known for their deep red colour and distinctive flavor, which is both sweet and tangy.

How to Grow from Seed:

  1. Seed Starting: Start San Marzano tomato seeds indoors 6 to 8 weeks before the last expected frost date in your area. Use a seed-starting mix or potting soil in seed trays or small pots. Plant the seeds 6 mm deep and water them lightly.
  2. Germination: Place the seed trays or pots in a warm location with temperatures between 21°C to 27°C) Keep the soil consistently moist but not waterlogged. Tomato seeds typically germinate within 7 to 14 days.
  3. Seedling Care: Once the San Marzano tomato seedlings have emerged, provide them with plenty of light. Keep the soil evenly moist and fertilize the seedlings with a diluted liquid fertilizer every 2 weeks.
  4. Transplanting: Transplant the San Marzano tomato seedlings outdoors after the danger of frost has passed and the soil has warmed up. Choose a sunny location with well-drained soil. Space the plants 0.6 to 0.9 meters apart to allow for proper air circulation and growth.
  5. Support: Install stakes or tomato cages around the San Marzano tomato plants to support them as they grow. Tie the main stems to the stakes or cages using soft garden twine to prevent them from bending or breaking under the weight of the fruit.
  6. Watering and Fertilizing: Water the San Marzano tomato plants regularly, providing about 1 to 2 inches (2.5 to 5 cm) of water per week, adjusting based on rainfall and weather conditions. Fertilize the plants every 3 to 4 weeks with a balanced fertilizer to promote healthy growth and fruit production.
  7. Pruning: Remove any suckers that develop in the leaf axils of the San Marzano tomato plants to encourage larger fruits and better air circulation. You can also prune away any yellowing or diseased leaves to maintain plant health.
  8. Harvesting: San Marzano tomatoes are ready to harvest when they reach full size and deep red color. Gently twist or cut the fruits from the vine, being careful not to damage the stems or surrounding foliage. Store harvested tomatoes at room temperature and use them promptly for best flavor and quality.

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Seed Count: 22

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