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Tomatoes need full sun (6-8+ hours daily), even soil moisture, and a support structure like a cage or stake as they grow. Blossom end rot from inconsistent watering is the most common failure. Determinate varieties fruit all at once and stay compact; indeterminate varieties keep producing until frost and need taller support. A single seedling costs $3-8 and can yield several kilograms of fruit over a season.
Key facts
- Native to the Andean region of western South America, though it was first domesticated as a garden crop in Mesoamerica.
- Botanically a fruit, but legally classified as a vegetable in the US since an 1893 Supreme Court ruling on import tariffs.
- Determinate varieties grow to a fixed size and fruit within a short window; indeterminate varieties keep growing and fruiting until frost kills them.
- Leaves and stems are mildly toxic if eaten in quantity (they contain solanine), but the ripe fruit is completely safe.
Growing requirements#
| Plant type | Outdoor (warm season annual, though it grows year-round in a greenhouse) |
| Growing medium | Soil or large containers (minimum 40L for indeterminate varieties) |
| Light needs | Full sun — 6-8+ hours of direct light daily |
| Water frequency | Deep, even watering 2-3 times a week; consistency matters more than frequency |
| Humidity | Moderate; high humidity combined with wet foliage increases fungal disease risk |
| Temperature range | 18-29°C (65-85°F); fruit set drops sharply above 32°C (90°F) or below 10°C (50°F) |
| Fertilizer | Balanced feed at planting, then a lower-nitrogen, higher-potassium feed once flowering starts |
| Soil pH | 6.0-6.8 (slightly acidic) |
| Drainage needs | High — waterlogged roots cause wilting and disease even in full sun |
| Support recommendation | Cage or stake installed at planting time, especially for indeterminate varieties |
| Hardiness | Grown as an annual almost everywhere; frost-tender, dies at first freeze |
| Toxicity | Leaves and stems mildly toxic if eaten in quantity (solanine); ripe fruit is safe |
Growth, harvest & propagation#
| Days to harvest | 60-85 days from transplant, varies by variety |
| Yield per plant | 6-8kg+ over a season for a healthy indeterminate plant |
| Edible parts | Ripe fruit; leaves and stems are not eaten |
| Propagation methods | Seed (start indoors 6-8 weeks before last frost) or nursery seedling transplant |
| Growth habit | Determinate (bushy, fixed size) or indeterminate (vining, keeps growing until frost) |
| Pruning needs | Remove suckers (side shoots) on indeterminate varieties to focus energy on fruit |
| Companion plants | Basil, marigold; avoid planting near brassicas or fennel |
Common problems & troubleshooting#
| Symptom | Likely cause | Fix |
|---|---|---|
| Black, sunken spot on fruit bottom | Blossom end rot from inconsistent watering | Water evenly on a schedule; mulch to retain consistent soil moisture |
| Yellowing lower leaves with brown spots | Early blight (fungal) | Remove affected leaves, improve airflow, avoid overhead watering, apply a copper fungicide if severe |
| Flowers dropping without fruiting | Temperature stress (too hot or too cold) or poor pollination | Wait for temperatures to moderate; hand-pollinate by gently shaking flower clusters |
| Squiggly white lines in leaves | Leaf miner larvae | Remove and destroy affected leaves; introduce parasitic wasps or use neem oil |
| Cracked fruit skin | Irregular watering, often a dry spell followed by heavy watering or rain | Maintain consistent soil moisture with mulch; harvest slightly early before heavy rain |
Get a blossom-end-rot warning before it happens
Sodate tracks your watering consistency and local weather to flag the exact conditions that cause blossom end rot, before symptoms show.
Seasonal care#
Varieties & cultivars#
| Variety | Distinguishing trait | Growth habit |
|---|---|---|
| 'Roma' | Oval, meaty fruit, low seed count, good for sauce/canning | Determinate |
| 'Cherry' / 'Sweet 100' | Small, sweet fruit, very high yield, good for containers | Indeterminate |
| 'Beefsteak' | Large fruit (300g+), classic slicing tomato | Indeterminate |
| 'Early Girl' | Fast to harvest (~50 days), reliable in cooler climates | Indeterminate |
Buying checklist#
- Seedling stem is sturdy and dark green, not thin or pale
- No yellowing leaves or dark spots on the seedling
- Roots are visible but not circling tightly at the pot base (not rootbound)
- Check the variety label for determinate vs indeterminate before choosing support structures
- Choose a variety suited to your climate's growing season length
Pricing by region#
| Region | Price range | Typical unit | Basis |
|---|---|---|---|
| US | $3 – $8 | Single seedling, 4in pot | Garden centre + nursery retail |
| UK | $2 – $6 | Single seedling | Garden centre retail |
| India | $0.25 – $0.70 | Single seedling | Local nursery + agri supply |
| Australia | $3 – $9 | Single seedling | Nursery + garden centre |
| Canada | $3 – $7 | Single seedling | Garden centre retail |
USD figures are approximate conversions for comparison; switch the dropdown to see each region's actual local-currency listing price.
Often confused with#
Regional naming note#
"Tomato" is consistent globally, unlike many houseplant common names — but variety names vary by seed catalogue and region, so always check the botanical/variety name on the seed packet rather than relying on a common name alone when ordering seeds internationally.
Where seedlings are actually grown#
Unlike ornamental houseplants, tomato seedlings are typically grown locally and regionally rather than shipped internationally — most garden centres source from regional greenhouse growers timed to the local planting season, since seedlings don't ship or store well. Seeds, by contrast, are commonly sourced from specialist seed companies regardless of region.
Import & biosecurity restrictions#
| Region | Note |
|---|---|
| Australia | Seed imports require an import permit and phytosanitary certificate under strict biosecurity law; live seedlings cannot be imported personally. |
| US | Domestic seed/seedling sale unrestricted; personal seed imports from some countries require a USDA permit. |
| UK | Seed imports from the EU generally unrestricted for home use; commercial imports need phytosanitary documentation. |
| India | No domestic restriction; imported hybrid seed varieties may require customs clearance. |
| Canada | CFIA seed import rules apply for commercial quantities; small home-garden seed packets typically clear without issue. |
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Frequently asked questions
Does tomato need full sun?
Yes, tomatoes need 6-8 or more hours of direct sun daily for good fruit production; shaded plants grow leggy and produce little fruit.
How much does a tomato seedling cost?
A single seedling typically costs $3-$8 in the US, or seeds for a whole season's crop cost only a few dollars per packet.
Why do my tomatoes have black spots on the bottom?
This is blossom end rot, caused by inconsistent watering that disrupts calcium uptake, not usually a soil calcium deficiency. Water evenly and mulch to retain consistent soil moisture.
What is the difference between determinate and indeterminate tomatoes?
Determinate varieties grow to a fixed size and produce most of their fruit in a short window, good for canning. Indeterminate varieties keep growing and fruiting continuously until frost, needing taller support.
Are tomato leaves poisonous?
Tomato leaves and stems contain solanine and are mildly toxic if eaten in large quantities, but the ripe fruit itself is completely safe to eat.
