San Marzano

Family: Solanaceae Nightshade

Sun-warmed and richly aromatic, San Marzano paste tomatoes ripen to a deep, velvety red with a firm, meaty interior and a pleasantly low-seed count.

Their elongated, tapered shape holds its structure beautifully, delivering a dense, spoonable texture that’s ideal for thick sauces and slow-simmered favorites, as well as roasting for concentrated flavor. Grow these in cool-season confidence for a harvest that tastes unmistakably classic—bright, savory, and beautifully concentrated.

Light: Full SunMaturity: 75 DaysHabit: Indeterminate

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 7th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Jun 20th
Harvest Begins	Sep 3rd
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Indeterminate
Support Needed	Stake
Planting Depth	Deep
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	10

Culinary Notes

Chef's Note

San Marzano’s low-seed, high-meat flesh cooks down into a dense, velvety sauce without the watery churn you get from juicier slicers. Use it where you need spoonable thickness—its acidity stays bright while it turns deeply savory under a long simmer.

Best Uses

slow-simmered passata-style sauce that clings to pasta
thick tomato ragù or meat sauce where you want minimal watery bleed
roasted wedges or halves for concentrated, jammy edges
pizza sauce base that stays cohesive under heat

Flavor Profile

bright, savory tomato tang dense meaty interior with low seediness low-water, spoonable texture that thickens fast classic roasted-sweet aroma when cooked

Kitchen Pairings

extra-virgin olive oil garlic oregano parmesan mozzarella browned beef or pork

Frequently Asked Questions

What pest or disease most commonly affects Solanum lycopersicum (San Marzano tomato), and how do I manage it?

Early blight and Septoria leaf spot are common on tomatoes, showing up as dark spots with yellowing on lower leaves. Remove and discard infected lower foliage, improve airflow with wider spacing and stake/tie plants upright, and water at the soil line to keep leaves dry. If the problem spreads, spray a labeled tomato fungicide early (start when spots first appear) and repeat according to the label interval.

How often should I water San Marzano tomatoes during the main growing phase?

During active flowering and fruit set, keep soil evenly moist by watering deeply about 1–2 times per week, aiming for consistent moisture rather than daily light watering. Water when the top 1 inch of soil feels dry, and apply enough to soak the root zone (roughly 6–12 inches). Mulch after plants are established to reduce swings in moisture that can trigger blossom-end rot and cracking.

How can I tell when San Marzano tomatoes are ready to harvest?

Harvest when fruits reach full red color (or deep red if grown for slightly firmer fruit) and feel firm but not hard—San Marzano should be elongated and heavy for its size. If you gently lift a ripe fruit, it should detach with minimal force from the vine. Plan harvests around day 75 from transplant (or roughly 70–80 days depending on conditions) and pick often to keep plants producing.