Planting
Tomatoes thrive in warm conditions. Plant seedlings outdoors only after all risk of frost has passed and the soil has warmed to at least 10C (50F). Choose a sunny spot that receives at least 6-8 hours of direct sunlight daily.
Space plants 45-60cm apart, depending on the variety. Determinate varieties stay more compact, while indeterminate varieties need more room to spread. Plant deeply, burying about two-thirds of the stem. This encourages a stronger root system as the buried stem develops additional roots.
Soil Preparation
Tomatoes grow best in fertile, well-draining soil with a slightly acidic to neutral pH of 6.0-7.0. Work plenty of organic matter such as compost or well-rotted manure into the soil before planting. This improves soil structure, drainage, and fertility.
If you are growing tomatoes in containers, use a high-quality potting mix rather than garden soil. Containers should be at least 30cm in diameter for determinate varieties and 45cm or larger for indeterminate types.
Watering
Consistent watering is essential for healthy tomato plants and good fruit development. Water deeply at the base of the plant, keeping the foliage dry to reduce the risk of disease. Aim for 2-3 litres per plant per week during active growth, increasing during hot weather.
Uneven watering leads to common problems such as blossom end rot (dark sunken patches on the fruit base) and fruit cracking. Mulching around the base of the plant helps retain moisture and maintains more consistent soil temperatures.
Feeding
Tomatoes are heavy feeders. Apply a balanced liquid fertiliser every two weeks once the first fruits start to form. Switch to a high-potassium fertiliser once the plants begin flowering and fruiting, as potassium promotes strong fruit development and abundant yields.
Look for fertilisers specifically formulated for tomatoes, which have an NPK ratio that supports both leafy growth and fruit production. Follow the manufacturer instructions to avoid overfeeding, which can produce lush foliage at the expense of fruit.
Pests and Diseases
Tomato plants can be affected by several common pests and diseases:
Aphids – Small insects that cluster on young shoots and the undersides of leaves. They can be removed with a strong water spray or controlled with insecticidal soap.
Blight – A fungal disease that causes brown spots on leaves and stems, often in wet weather. It spreads rapidly and can devastate crops. Choose resistant varieties and ensure good air circulation around plants.
Blossom end rot – As mentioned above, this is caused by calcium deficiency due to uneven watering. Maintain consistent moisture levels to prevent this condition.
Whitefly – Tiny white insects found on the undersides of leaves. Yellow sticky traps and biological controls such as parasitic wasps can help manage infestations.
Prevention is the best approach: rotate crops, keep the garden clean, water at soil level, and remove any affected plant material promptly.
Harvesting
Tomatoes are ready to harvest when they have reached their full colour and feel slightly firm when gently squeezed. For the best flavour, allow fruits to ripen on the plant whenever possible.
Harvest regularly to encourage continued production. In cooler climates or late in the season, you can pick tomatoes that have started to colour and finish ripening indoors on a sunny windowsill.
Store harvested tomatoes at room temperature and use within a week for the best flavour and texture.
