Seeds can be sown in different ways: in situ, in the nursery or under a frame. The seedlings are placed in the ground, in the final position of the plants. They avoid transplanting operations, but require "thinning" of the plans as they develop. In other words, pull some plants to leave enough room for others to ensure good growth. Seedlings in the nursery are particularly sensitive or delicate for species that need to be sown early in the year or will be transplanted later into the ground or into the planting on the balcony. The seat is reserved for garden owners. They allow the harvesting of vegetables at the beginning of the year, such as tomatoes, lettuce and cabbages, which are deliberately intended for transplanting.