When to plant Tomatoes in the UK

Sow seeds indoors in modules or small pots around mid-March to early April. Use a heated propagator or warm windowsill at 18–21 °C for germination. Keep the compost moist but not waterlogged.

Once seedlings develop their first true leaves, prick them out into individual pots around early April to late April. Handle seedlings by the leaves to avoid stem damage and plant at the same depth as before.

Move plants into larger pots around mid-April to early May to prevent root restriction. Use a good quality potting compost and water well after repotting to settle the roots.

Gradually acclimatise plants to outdoor conditions over 10-14 days starting around mid-May to late May. Place them outside in a sheltered spot during the day and bring in at night, increasing exposure each day.

Plant tomatoes in their final position around late May after frost risk has passed. Space plants 60 cm apart in fertile, well-drained soil. Water in well and consider using cloches or fleece for extra protection.

Provide stakes or cages for support from late May. For cordon varieties, remove side shoots regularly to direct energy into the main stem, and pinch out the main growing tip after 4-6 trusses have set to help fruits ripen in the UK climate.

Apply a high-potassium liquid fertiliser every 14 days starting around early June and continuing until late October. This supports flowering and fruit development. Water plants regularly to prevent blossom end rot.

Pick fruits as they ripen from early August until late October. Harvest regularly to encourage more production. If frost threatens, pick green tomatoes and ripen indoors on a windowsill.