San Marzano is the gold standard of Italian plum tomatoes — a beloved heirloom known for its elongated shape, thick walls, minimal seeds, and rich, balanced flavour. Grown traditionally in the volcanic soils near Mount Vesuvius, San Marzano tomatoes have been a staple of Italian cooking for generations, particularly prized for sauces, paste, and canning.

These open-pollinated seeds are from carefully maintained lines that reflect the original San Marzano dell’Agro Sarnese-Nocerino type, though they are adapted for diverse growing conditions. The plants are indeterminate and vigorous, producing heavy clusters of oblong, deep red fruits averaging 4–6 oz. Ideal for slow-simmered sauces, they hold their shape beautifully when cooked and deliver exceptional flavour without excess water.

Horticultural Points

• Botanical Name: Solanum lycopersicum
• Type: Open-pollinated heirloom
• Growth Habit: Indeterminate
• Days to Maturity: 75–85 days
• Fruit Size: 4–6 oz, elongated plum shape
• Flavour Profile: Rich, balanced, low-acid, meaty with few seeds
• Best Uses: Sauce, paste, canning, roasting

Growing Information

• Requires support for heavy fruit sets.
• Provide full sun and consistent moisture.
• Harvest when deep red and fully ripe for the best flavour and texture.

Note on Seed Source

• These seeds are open-pollinated selections of the classic San Marzano type.
• While true-to-type, minor variation may occur depending on growing conditions and seed line — ideal for gardeners interested in regional adaptation and seed saving.

Historical Background

• First grown in the 18th century near Naples, San Marzano tomatoes are protected by DOP (Denominazione d’Origine Protetta) status in Italy when grown in the Agro Sarnese-Nocerino region.
• This variety remains the top choice for authentic Italian tomato sauce and is revered for its deep cultural and culinary heritage.