Market gardening is practised near urban areas. Why?

Explanation

Market gardening specializes in the cultivation of high value perishable crops such as vegetables, fruits and flowers, solely for the urban markets. They are situated close to urban markets mainly because of the high value crops.
The crops are costly, hence they need to be situated close to a market where people have high purchasing power and also demand for high valued crops. In such a situation urban areas are the perfect markets. These crops are perishable in nature, hence farms cannot be situated far away from the main market. Therefore, farms are situated close to the urban markets So as to prevent crops from gelting stale.