I live in a warm climate so started my tomatoes outside, several seeds to a small pot. I used half plastic water bottles to cover each plants. The pots were stored in a large cardboard box (the type bananas come in to the greengrocer as these have a large plastic bag inside). The lids were closed at night and the whole cardboard box covered with the plastic bag, attached to the box with clothes pegs. In the daytime they were left open. They are now in individual 6" pots in the box so still protected, but without a lid. All my tomatoes are now strong bushy healthy little plants about 12" high. This method works for me as I have no greenhouse, coldframe or indoor windowsills and at minimal cost.
I live in a warm climate so started my tomatoes outside, several seeds to a small pot. I used half plastic water bottles to cover each plants. The pots were stored in a large cardboard box (the type bananas come in to the greengrocer as these have a large plastic bag inside). The lids were closed at night and the whole cardboard box covered with the plastic bag, attached to the box with clothes pegs. In the daytime they were left open. They are now in individual 6" pots in the box so still protected, but without a lid. All my tomatoes are now strong bushy healthy little plants about 12" high. This method works for me as I have no greenhouse, coldframe or indoor windowsills and at minimal cost.