Hydroponics is the another way to grow lettuce without soil but use water provided it contains the proper nutrients and fertilizers. The seeds are planted in the foam block with holes called an oasis and are coated in clay that holds in moisture to nourish the seed. Workers set them afloat the pool of water after first watering. The technicians always checks levels of oxygen and fertilizer that's the key to hydroponic growing. Workers are constantly watering. In winter the seedlings will grow slower than the summer due to less exposure. Later they separate the seedlings apart. Then, move the seedlings were planted with strong roots in other zones by hooks oasis parts to avoid damage plant roots for absorb water and nutrients. This process will happen while floating. When the plants grown by observing the root long size will move to the zone production. Which is the last move before harvest. This hydroponic system produces 500 plants per square meter. Without the use of pesticides and fungicides for growing because it's all indoors fertilizer can contaminate the environment. After the harvest, they cut unwanted parts out and wrap them around the trunk up then they vacuum cool each lettuce for longer shelflife