Of course it needs washing. Some parts of it may be dirty and have many bacteria. This is just a general small problem. What's important is that many vegetables are sprayed with pesticides by farmers. If they are sold before the specified date, there will be pesticide residues (which is the most deadly). You should have a certain understanding of the toxicity of pesticides, so if they are not from home or acquaintances, it is generally recommended to wash them with water for a while before burning them.