Garlic: It is a natural green medicine. Garlic can remove spots. Because garlic grows underground, it is spicy and has a pungent smell. Basically, pesticides are not used all year round.

Onion: Onion is a root vegetable, which has few pests and diseases and grows underground, so it is lightly polluted by pesticides.

Lettuce, because of its bitter leaves, less pests and diseases, good yield and short cycle. Lettuce, like spinach, is favored by vegetable farmers.