Tomato

The tomato is a fruiting plant in the nightshade family (Solanaceae), originating from western South America and now one of the world's most widely grown food crops. Its edible berries range from tiny cherry types weighing a few grams to large beefsteaks exceeding 400 g, and come in red, pink, yellow, orange, green, and purple. Plants range from compact dwarfs of 80 cm to vigorous indeterminate varieties reaching 200 cm or more. Full sun and warm, sheltered conditions are essential for good yields in Nordic climates.

Growing

Sow seeds indoors 7–8 weeks before transplanting, pressing them approximately 1 cm deep into moist seed compost. Maintain a germination temperature of 22–29 °C; germination occurs in 7–14 days. Once seedlings emerge, move them to a bright, airy position and maintain a growing temperature of around 18 °C. Pot on into larger containers when the first true leaves appear. Harden off plants gradually and transplant outdoors or into an unheated greenhouse only once night temperatures reliably stay above 12 °C. Space plants 50 cm apart in rows 50–70 cm apart.

Care

Water consistently and deeply to prevent blossom end rot and fruit cracking — irregular watering is a primary cause of both. Begin liquid tomato feed (high potassium) once the first flower truss sets and continue weekly throughout the season. Remove sideshoots (sucker) from indeterminate and tall varieties by pinching them out at the base while small; dwarf types rarely require this. Support tall plants with sturdy stakes or canes and tie in as they grow. In protected cultivation, shake or gently vibrate flower trusses to aid pollination. Remove lower leaves showing signs of disease to improve airflow.

Harvest

Harvest when fruits have reached their full colour and yield slightly to gentle finger pressure. For red varieties this means a fully uniform colour with no hard patches near the stem; coloured varieties (green, yellow, purple) are ripe when they turn translucent or lose the waxy sheen. Pick by snapping or cutting the stem just above the calyx. Harvest regularly to encourage continued fruit set; leave overripe fruits on the plant and production slows. Cherry types are ready from 55 days after transplanting; beefsteak types need up to 80 days.

In the kitchen

Tomatoes suit raw and cooked applications equally well. Slice large beefsteaks for sandwiches and salads; roast or grill medium-sized varieties to concentrate sweetness; cook down for sauces, soups, and passata. Cherry and grape types are excellent whole in salads or roasted on the vine. Acidity balances rich ingredients such as mozzarella, olive oil, and cured meat. Seeds and gel can be strained out for smoother preparations or left in for texture and flavour.

Storing

Ripe tomatoes keep best at room temperature, away from direct light, and should never be refrigerated — cold destroys flavour and changes texture. Use within 3–5 days at room temperature. For surplus, blanch, skin, and freeze whole or as purée for up to 12 months. Sun-drying or oven-drying concentrates flavour; store dried tomatoes in olive oil or an airtight container for up to 6 months. Tomatoes can also be preserved by pickling in vinegar brine or pressure-canning as whole fruits or sauce.