How to Grow Tomatoes: The Complete Guide

Growing tomatoes is one of the most rewarding things you can do in a home garden or yard. Whether you have acres of land or a single container on a balcony, fresh-picked tomatoes taste like nothing you can buy at a grocery store. This guide covers everything you need to know — from choosing varieties to harvest day.

Choosing the Right Tomato Variety

Tomatoes fall into two broad growth habits:

Determinate (bush) varieties grow to a fixed height (typically 60–90 cm / 2–3 ft), set fruit all at once, then stop. Great for containers, small spaces, and anyone who wants a big harvest for preserving. Popular choices: Roma, Celebrity, Rutgers.

Indeterminate (vining) varieties keep growing and producing until frost kills them. They need staking or caging but reward you with months of continuous harvests. Classics include Brandywine, Sungold, Black Krim, and beefsteak types.

For beginners, cherry tomato varieties like Sungold or Sweet Million are hard to beat — they're prolific, pest-tolerant, and forgiving of inconsistent watering.

Starting from Seed vs. Buying Transplants

Starting from seed gives you access to hundreds of heritage and unusual varieties, and it's cheaper at scale. Sow seeds indoors 6–8 weeks before your last expected frost date. Use a good seed-starting mix, keep the temperature around 21–27°C (70–80°F), and provide 14–16 hours of light per day (a simple grow light works well).

Buying transplants from a nursery is faster and requires no special equipment. Look for stocky, dark-green seedlings no taller than 20–25 cm (8–10 in). Avoid leggy or yellowing plants.

Planting Out

Tomatoes are warm-season crops that hate frost. Wait until nighttime temperatures stay reliably above 10°C (50°F) — this is typically after the last frost date in your region. In USDA Hardiness Zones 9–11 (or RHS Zone H3 and above), this can be as early as February or March. In colder climates (Zones 4–6), wait until late May or early June.

Hardening off is essential if you started seeds indoors: move seedlings outside for progressively longer periods over 7–10 days before planting. This acclimates them to wind, stronger sun, and temperature swings.

Deep planting trick: Unlike most vegetables, tomatoes can be planted deep — bury the stem up to the lowest set of leaves. Roots will form along the buried stem, creating a stronger, more drought-tolerant plant.

Spacing: Allow 45–60 cm (18–24 in) between bush varieties and 60–90 cm (2–3 ft) between vining types. Good airflow reduces fungal disease.

Soil and Feeding

Tomatoes are heavy feeders. Before planting, work in plenty of well-rotted compost or aged manure. They prefer:

pH: 6.0–6.8

Drainage: excellent — soggy roots invite disease

Nutrients: phosphorus for root development early on, then a switch to higher potassium and calcium as fruits develop

During the growing season, feed every 2 weeks with a balanced tomato fertiliser once flowers appear. Too much nitrogen early on causes lush foliage but few fruits.

Calcium note: Blossom end rot (a dark, sunken patch on the bottom of the fruit) is caused by calcium deficiency, often triggered by irregular watering rather than a lack of calcium in the soil. Keep watering consistent.

Watering

Inconsistent watering is the biggest cause of problems — split fruits, blossom end rot, and stressed plants invite pests. Aim for:

Deep, infrequent watering: 2–3 times per week, soaking the soil to 20–30 cm (8–12 in) depth

Water at the base of the plant, not overhead, to reduce fungal risk

Mulch generously: 7–10 cm (3–4 in) of straw or compost around plants regulates soil moisture and temperature

In hot climates (daytime above 32°C / 90°F), shade cloth can prevent blossom drop.

Staking and Pruning

Indeterminate varieties need support from early in the season. Options include:

Cages (convenient for bush types and small indeterminate varieties)

Single stakes with ties every 20–25 cm (8–10 in) as the plant grows

Florida weave / string trellis for rows of plants in a garden bed

Suckers are the shoots that emerge in the V between the main stem and a leaf branch. Pinching these out on indeterminate varieties keeps the plant focused on fewer, larger fruits. Leave suckers on determinate varieties.

Pest and Disease Management

Common issues worldwide:

| Problem | Symptom | Solution | |---|---|---| | Aphids | Clusters of tiny insects on new growth | Blast off with water; introduce ladybirds/ladybugs | | Hornworm | Large caterpillar, defoliation | Hand-pick; Bt (Bacillus thuringiensis) spray | | Blight (early/late) | Dark spots on leaves, rapid spread | Remove affected leaves; copper fungicide; choose resistant varieties | | Whitefly | Clouds of white insects when disturbed | Yellow sticky traps; neem oil |

Rotate where you plant tomatoes each year — never in the same bed for more than 2 years running. This breaks disease cycles in the soil.

Harvesting

Most tomatoes ripen 60–80 days from transplanting, depending on variety. Signs of ripeness vary by type:

Red varieties: uniform colour, slight give when squeezed

Yellow/orange varieties: check for a faint blush and soft shoulder

Heritage/heirloom types: colour changes are subtler — taste is the best guide

Pick tomatoes as they ripen rather than waiting. Once they begin to colour up, you can bring them inside at 18–20°C (65–68°F) to finish — never refrigerate unripe tomatoes, as cold destroys the flavour compounds.

At end of season, green tomatoes can be ripened in a paper bag with a ripe banana (the ethylene gas helps), or used for green tomato chutney.

Growing in Containers

Almost any tomato can be grown in a container if it's large enough — 30–40 litres (8–10 gallons) minimum for a vining type, 20 litres (5 gallons) for compact bush varieties. Container plants dry out faster, so check daily in summer and feed weekly (containers leach nutrients with frequent watering).

Self-watering containers are a game-changer for consistent moisture.

Ready to Share Your Harvest?

Once you've grown more tomatoes than you know what to do with, consider swapping your surplus with neighbours. Locavori connects you with people nearby who are growing, sharing, and swapping homegrown produce — because the best tomatoes are the ones grown close to home and shared with community.

Join Locavori for free → locavori.app/register