QuestionsHow to growTomatoesGreenhouse Growingseeds from last year’s tomatoes 0 Vote Up Vote Down anne Broderick asked 15 years ago Is it worthwhile cultivating seedlings from old fallen tomatoes. I have a few growing in greenhouse.or should I just grow from new seeds this year? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago It is very late to be sowing seeds for tomatoes now … they should be sown in February or early March. The seedlings will give you some bit of head-start and are perfectly viable to use, but if they are small they will be a bit late too.