Botanical Name: Solanum lycopersicum
Days to Maturity: 70–90 days from transplanting
Hardiness: Frost-sensitive annual
Plant Dimensions: Vines up to 6′ or longer
Variety Information: 3″–4″ long, 1 ½” wide, oblong, red fruits. ‘San Marzano’ is a “paste” tomato.
Type: Indeterminate, Paste, Slicer (Learn more)
When to Sow Outside: For mild climates only: 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F.
When to Start Inside: RECOMMENDED. 4 to 6 weeks before transplanting. Transplant when air temperature is 45°F or warmer, usually 1 to 2 weeks after your average last frost date. Ideal soil temperature for germination is 70°–90°F.
Days to Emerge: 5–10 days
Seed Depth: ¼”
Seed Spacing: A group of 3 seeds every 24″–36″
Row Spacing: 36″
Thinning: When 2″ tall, thin to 1 every 24″–36″
Harvesting: ‘San Marzano’ tomatoes are at the peak of sun-ripened deliciousness when red, and have a slight give when gently squeezed.