1. If you buy at home, it is recommended not to buy too much at a time, depending on the season. Usually you can buy vegetables that a family can eat for 2-3 days in winter, and you can buy them on the same day in summer. 2. If it is a company canteen purchase, first of all, according to the menu planning of the company canteen to determine the types of vegetables to be purchased, which are storable and which are not storable. If you need to purchase a large number of vegetables that cannot be stored, in order to ensure the timely use of vegetables without shortage, it is recommended to communicate with fixed vegetable supply places (such as supermarkets and vegetable markets) in advance to confirm whether such vegetables can be continuously supplied.