Hors-sol and hydroponics
In the greenhouses, farms often don’t grow the vegetables in the ground, but rather “hors-sol”. The vegetables are grown on a so-called substrate, which may, for example, comprise coconut fibres. This type of vegetable cultivation is both efficient and ecological as the cycles are closed. It necessitates fewer resources such as soil and water and no fertiliser is lost. Furthermore, the risk of the plants being infected by diseases from the soil is also smaller. This reduces the need for pesticides. The use of the hors-sol method is prohibited in organic farming. Organic vegetables must be grown on real soil. Meanwhile, there are also lettuces that grow as “hydroponics”. Here, the lettuce is placed directly in water with its roots and is then sold including the roots. This means that is has a longer shelf life.