1. Cottonseed is a common wild vegetable. It is covered with white hair and has strong adaptability to the environment. Its leaves are spoon-shaped or oblanceolate, and its flowers are golden yellow, which can be picked and eaten at ordinary times.

2. Pteridium aquilinum is a wild vegetable of Pteridaceae, which is widely distributed in China. Especially in sunny environment, the whole plant is edible, which has high medicinal value and can play the role of invigorating spleen and benefiting qi and preventing cancer.

3. Portulaca oleracea is millet and can also be used as a longevity vegetable. Its vitality is extremely vigorous and tenacious, and it is distributed in the north and south of China, especially on the roadside in the fields. If eaten in moderation, it can play a good role in clearing away heat and toxic materials, diuresis and stranguria.