What is companion plant?

Associated plants rely on human active communication, expanding the distribution of plants. The distribution of associated plants, some of which are caused by the wildness after human conscious introduction; Some are unconsciously spread by human activities, including some harmful plants and farmland weeds. Weeds such as Chenopodium album and Salsola salsola are widely distributed in Europe and North America, and were brought to North America by European immigrants. Associated plants all over the world have different flora. For example, in Victoria, Australia, there are 57 associated plants from Europe, 1 1 from North Africa and Central Africa, 29 from South Africa and 2 from Asia.

Generally speaking, herbaceous plants are more likely to occupy human space or be spread by human beings because of their strong overall vitality and strong adaptability to the environment.

I don't know if there is a book introducing a periodical: China chinese bulletin of botany, which is likely to contain accompanying plants. I remember an article "Associated Plants in Cities" (Institute of Botany, Chinese Academy of Sciences, Jiang Gaoming) came from here.