Here is a question about this article: The radish is also a typical food representing people of Nanjing, which has been spread through word of mouth as an interesting fact for many years in China. According to Nanjing.GOV.cn, "There is a long history of growing radish in Nanjing especially the southern suburb. In the spring, the radish tastes very juicy and sweet. It is well-known that people in Nanjing like eating radish. And the people are even addressed as 'Nanjing big radish', which means they are unsophisticated, passionate and conservative. From health perspective, eating radish can help to offset the stodgy food that people take during the Spring Festival".
What is the answer to this question: Which area has the longest history of growing radish?
the southern suburb