They just need a little gentle heat in a frost-free greenhouse.
There is nothing finer than being able to pick your own fresh tomatoes in the summer. The taste is wonderful, simply because you can allow the fruits time to fully ripen on the plants and therefore develop their own, individual flavour.
Growing tomatoes from seed is not difficult as long as you can provide a little gentle heat while the seeds are germinating and also to nurture the small seedlings on afterwards. A propagator in a frost-free greenhouse is ideal, or a small windowsill propagator can be used as an alternative.
The secret is not to sow too early in the season. If you want plants to grow in a cold greenhouse now is a good time to sow to produce plants for planting out or potting into large pots or grow-bags in late April. To raise plants to be grown outside, wait a few more weeks as you don’t want the plants to be ready until late May or after the risk of frost has passed. If you start too early, you often end up with weak, leggy plants.
After the seed has germinated which can take between one and two weeks, depending on the temperature, the seedlings will need light, warm (but not too warm) conditions to grown on for several weeks.