Aquatic plants grown under European technology do not use pesticides so the safety in use is almost absolute. Vegetable seeds are imported from the Netherlands, with the price of 1,000-3,000 VND / seed. Before planting, the seedlings should be germinated and germinated after 2 weeks. As nutrients are mixed in water, automatic rotation 24/24 so the tree grows very uniform, green and open free from pests. At present, her vegetable garden grows 18 kinds of lettuce vegetables by hydroponic method, the planting density is 25,000 plants / 1.000 m2.