🍅 Tomato 'San Marzano'

Sowing window (UK)	March to April
Minimum soil temperature	15°C at seed depth
Sowing depth	1 cm
Spacing	75 cm apart
Days to germination	10 days
Days to harvest	119 days
Sowing method	Start under cover, transplant out
Frost hardy	No
Sun	full-sun
Watering	high
Plant family	Solanaceae

When should I sow Tomato 'San Marzano' in the UK?

In the UK, sow Tomato 'San Marzano' from March to April. It is normally started under cover and transplanted. Wait until the soil has reached 15°C at seed depth rather than going by the calendar - tomato will sit and rot in cold ground.

What soil temperature does Tomato 'San Marzano' need to germinate?

Tomato 'San Marzano' needs a minimum soil temperature of 15°C at seed depth to germinate reliably. Below that, germination is slow and patchy, and seed is more likely to rot than sprout. Measure at around 5cm down, in the morning, rather than trusting air temperature.

How deep and how far apart should I sow Tomato 'San Marzano'?

For Tomato 'San Marzano', sow it 1cm deep and space plants 75cm apart.

How long does Tomato 'San Marzano' take to grow?

Tomato 'San Marzano' takes roughly 119 days from sowing to harvest. Seed usually germinates in about 10 days.

Is Tomato 'San Marzano' frost hardy?

No. Tomato 'San Marzano' is not frost hardy. Do not put it outside until the risk of frost has passed in your area, and be ready to fleece it if a late frost is forecast.

Sowing data cross-checked against RHS growing guides and UK seed-merchant catalogues. Soil temperatures are the minimum for reliable germination, measured at seed depth.