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tomato
Solanaceae
San Marzano Determinate Tomato Seeds
Solanum lycopersicum
Product code : WESTO-0231
This determinate San Marzano is an Italian heirloom with bright red, plum-shaped fruit suitable for sauces and preserving. Grow paste tomatoes for sauces and preserves from plants with a more limited growth habit. Do not automatically prune this determinate tomato as if it were an indeterminate variety.
- Quantity
- 200 to 250 seeds
- Exposure
- Full sun
- Life cycle
- Annual
Discover the plant
Common nameDeterminate tomato
FamilySolanaceae
GenusSolanum
Specieslycopersicum
CultivarSan Marzano
Typetomato
Botanical nameSolanum lycopersicum
Heirloom varietyYes
San Marzano Determinate Tomato Seeds (Solanum lycopersicum) This determinate San Marzano is an Italian heirloom with bright red, plum-shaped fruit suitable for sauces and preserving. Grow paste tomatoes for sauces and preserves from plants with a more limited growth habit.
Start indoors 5 to 6 weeks before transplanting after frost danger. Sow about 6 mm deep. Keep the seedbed evenly moist through emergence. Allow 30 to 60 cm for determinate plants; 60 to 90 cm for indeterminate plants. Provide full sun and avoid standing water. A germination temperature of 24 to 29°C is appropriate for this crop. Thin crowded seedlings early and harden indoor-started plants gradually before transplanting.
Do not automatically prune this determinate tomato as if it were an indeterminate variety. Harvest ripe red fruit for sauce or preserving.
Sowing guide
It all startswith a seed.
Sowing depth
6 mm
Spacing / density
30 to 60 cm for determinate plants; 60 to 90 cm for indeterminate plants
Germination temperature
24 to 29°C
Germination time
5 to 7 days
Sowing period
Start indoors 5 to 6 weeks before transplanting after frost danger
Propagation
Seed
Growing method
Prepare a clean seedbed or containers with moderately rich, well-drained soil. Start indoors 5 to 6 weeks before transplanting after frost danger. Sow about 6 mm deep unless the packet gives a more specific direction. Use the following spacing as the crop develops: 30 to 60 cm for determinate plants; 60 to 90 cm for indeterminate plants. Keep the medium evenly moist during emergence without leaving it saturated. Provide full sun and good air movement. Thin crowded seedlings early so the remaining plants develop without unnecessary competition. Harden indoor-started plants gradually before transplanting them outdoors after the appropriate frost date. Regular watering at soil level.
Soil and care
The right care,at the right time.
Soil pH
6.0 to 6.8
Watering
Regular watering at soil level. Check moisture at soil level instead of watering only by schedule. Water gently during germination so seeds are not displaced, then direct irrigation toward the root zone. Avoid standing water and adjust frequency after rain.
Soil type
‘San Marzano’ determinate tomato performs best in moderately rich, well-drained soil. Loosen compacted ground before sowing and remove large stones or persistent weeds. Mature compost may improve poor soil, but avoid creating a heavy or waterlogged seedbed.
Fertilization
Prepare the soil with mature compost when fertility is low. A light, balanced fertilizer may be used according to its label, but excessive feeding can cause weak or unbalanced growth. Observe leaf colour and plant development before adding more nutrients. Water after any application.
Seasonal care
At sowing time, prepare moderately rich, well-drained soil and follow this timing: Start indoors 5 to 6 weeks before transplanting after frost danger. Keep the surface moist until emergence, label the row, and thin seedlings according to the recommended spacing. During active growth, provide full sun and monitor soil moisture, weeds, and leaf condition. Regular watering at soil level. In warm or windy weather, check containers and exposed beds more frequently. Remove damaged material and keep enough space for air circulation. At harvest or after flowering, use clean tools and clear unhealthy debris. Healthy residue may be composted where appropriate. At the end of the season, clean containers and tools, record useful observations, and store remaining seed in a cool, dry, dark place.
Container growing
A garden,within reach.
In containers, provide a generous volume of potting mix and secure the support before the stems grow.
Bloom and dimensions
Its place,in your garden.
Mature height
10 to 12 in
Days to maturity
70 to 75 days
Harvest
Harvest ripe red fruit for sauce or preserving.
Garden associations
In goodcompany.
Companion plants
Basil can grow near tomatoes when each plant has its own root space and adequate light.
Other recommended plants
Yellow Tondino Cherry Tomato; Tondo Liscio Tomato; San Marzano Indeterminate Tomato
Frequently asked questions
Your questions,answered.
How should ‘San Marzano’ determinate tomato be sown?
Start indoors 5 to 6 weeks before transplanting after frost danger. Prepare moderately rich, well-drained soil. Sow about 6 mm deep. Keep the seedbed evenly moist until emergence without saturating it. Label the row and provide full sun. Thin crowded seedlings so the final spacing follows this guidance: 30 to 60 cm for determinate plants; 60 to 90 cm for indeterminate plants. If plants are started indoors, provide strong light and harden them gradually before transplanting outdoors at the appropriate time.
Where should I grow San Marzano Determinate Tomato?
Light: Full sun. Prepare soil that retains moisture without remaining saturated. Light: Full sun. ‘San Marzano’ determinate tomato prefers full sun and moderately rich, well-drained soil. Choose a location that leaves enough room for 30 to 60 cm for determinate plants; 60 to 90 cm for indeterminate plants. Avoid low spots where water remains after rain. In a container, use drainage holes and a clean growing mix. Observe how light moves across the space during the day, especially near buildings or taller plants.
How should I water San Marzano Determinate Tomato?
Keep moisture consistent as tomatoes swell; avoid sudden changes between dryness and saturation. Regular watering at soil level. During germination, use a gentle spray or careful watering so seed is not displaced. After establishment, water at soil level when the surface begins to dry. Adjust frequency to rainfall, heat, wind, soil texture, and container size. Avoid standing water because roots still require oxygen. Morning watering can help foliage dry normally during the day.
What maintenance does ‘San Marzano’ determinate tomato need?
Keep the planting labelled, weeded, and appropriately spaced. Check young plants regularly for wilting, chewing damage, discolouration, or crowding. Provide full sun and maintain the moisture pattern described for the crop. Use clean tools, avoid deep cultivation near established roots, and remove unhealthy debris. Apply any fertilizer or pest-control product only according to its label.
When should I harvest San Marzano Determinate Tomato?
Harvest ripe red fruit for sauce or preserving. Do not automatically prune this determinate tomato as if it were an indeterminate variety.
For a great start to your seeds
The right extras.Right here.
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