Sow these seeds about 3 mm deep in seed flats or pots or even Jiffey peat pellets. Seeds germinate best at a temperature of around 24oC. When the seedlings have developed 2 or 3 true leaves prick them out into 5 to 6 cm diameter pots. Keep the potting soil moist and place the plants in a warm, brightly light area. English Planting Rhyme A sheltered sunny site is essential for outdoor tomato production. Well-rotted manure or other organic matter should be incorporated into the soil and a balance fertilizer added before planting.
Tomatoes are susceptible to similar soilborne pests and diseases as potatoes and so rotate the site.
As tomatoes are easily damaged by frost wait until the spring weather is warm and the danger of frost has passed before planting the young plants in the garden. It is best if you introduce your young tomato plants to the great outdoors gradually. In other words these young and tender plants need to be 'hardened off' so they can withstand the cool night time temperatures. In fact continued protection should be provided during the early stages using cloches or perforated plastic sheets. Tall indeterminate types may be planted 40 to 45 cm apart alongside supports about 1.2 m tall.