Growing Tomato in a pot

Tomatoes have high water needs and consistent moisture is critical for healthy fruit development. Water deeply two to three times a week in dry weather, more often for container-grown plants, aiming to keep the soil evenly moist but not waterlogged. Irregular watering causes blossom end rot (black patches on fruit) and split skins. Water at the base of the plant, not overhead, to minimise fungal disease risk. Feed regularly from May through August once the first fruits begin to set. Use a high-potash liquid tomato fertiliser every 10–14 days, following the manufacturer's instructions. Potassium promotes flowering and fruiting; nitrogen-heavy feeds produce leafy growth at the expense of tomatoes. Container plants may need feeding weekly as nutrients leach out faster. Tomatoes are tender perennials grown as annuals in temperate Europe; they cannot survive frost and are hardy only to zone 10a–12b, far warmer than our climate. Outdoor plants will be killed by the first autumn frost, so harvest all remaining fruit in late September or early October. Green tomatoes can ripen indoors on a windowsill. Watch for blight (brown patches on leaves and fruit), especially in wet summers. Remove affected foliage immediately and avoid overhead watering. Whitefly and aphids can be problems under glass; use biological controls or insecticidal soap. Refresh mulch mid-season to maintain moisture levels and suppress weeds, and ensure greenhouse plants have good ventilation to prevent botrytis and other fungal issues in humid conditions.