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Sowing Tomato Seeds Indoors

This is one of the commonest methods and produces good results. Sow each seed (two if you have a surplus) in a 7.5cm (3in) pot, lightly covering them with potting compost. Ensure the compost is moist but not waterlogged. Place them in a warm (up to 27C or 80F) draught free place - the seedlings should emerge in 7 to 10 days time.

Immediately this happens, move the plants to a light position (a light windowsill is ideal), but out of direct sunlight to avoid burning the leaves. Try and position the plants so that they avoid large changes in temperature. This most commonly happens when the curtains are drawn at night, leaving plants in a quickly cooling area.
Where more than one seed has been sown per pot, thin out the least healthy seedling as soon as they are large enough to handle.

When the roots start to come through the base of the pot (about 4 weeks after sowing), transfer the plants to larger 12.5cm (5in) pots.

The plants will be large enough to transplant outside about 7 weeks after sowing the seed. Refer to the main article for details on how to plant tomatoes.