Judging from the growth process of Chinese cabbage. In the early stage, the outermost true leaves of Chinese cabbage grow first. The leaf angle is very open, showing a regular disc shape. Then, in the leaf cup, begin to "fill the heart". In other words, after the leaf cup is basically wrapped, the heart leaves begin to grow and enrich from the inside. According to this growth law, many people think that Chinese cabbage is the cleanest and does not contact with the outside world. In fact, if you look at the dust and impurities, there is basically no cabbage. However, from the perspective of pesticide residues, this is not the case.

Cabbage looks clean on the surface, but there are actually many bacteria invisible to the naked eye. During the growth process, insects will patronize the above harmful pesticide components, as well as dust, various harmful substances and bacteria in the air. If we don't clean them, they will hurt our bodies unconsciously. So take them down one by one, rinse them with clear water several times, and then clean the last cabbage.

Generally speaking, the inner layer of Chinese cabbage is cleaner than the outer layer. This is because it grows from the inner layer. In other words, when pesticides are applied, if the cabbage has not grown and the leaves outside are sprayed with pesticides, then the heart has not grown. When the heart grows out, pesticides are not easy to enter because of cabbage. As for the pesticides absorbed into cabbage from the roots,

Because in Chinese cabbage tissues, cleaning is useless, and pesticide residues in tissues cannot be cleaned. The filling period of Chinese cabbage has entered winter. At this point, the temperature drops and insects cannot regenerate. So there is no need to spray pesticides at all, so there is no problem of pesticide residues. Therefore, as long as the heart of Chinese cabbage is clean and not exposed, there is no need to clean it.

If there are chemical residues, it is not clean to clean the surface with our general domestic water. Some people say that in fact, Chinese cabbage needs at least two kinds of pesticides to grow. One is applied to the roots of Chinese cabbage to avoid agricultural damage to the soil. If you don't have enough, you can't keep the roots even if you eat Chinese cabbage. In addition, pesticides should be used on leaves to prevent agricultural damage. There is no way to verify the truth. After all, cabbage is not expensive now. The use of pesticides is too much, the cost is rising, and vegetable farmers are not willing.

Does the inner layer of Chinese cabbage need cleaning? Under normal circumstances, most people only wash a few cabbage leaves outside, and most people don't. But some people think that they should wash it anyway, otherwise they will feel uncomfortable. When the cabbage is ripe, the leaves near the outer layer will slowly roll up and surround the middle leaves. The middle part is originally wrapped directly, some need to absorb sunlight and stretch, and the last part of the leaves will roll up.

Therefore, it can be said that only the outside is in direct contact with the outside world. If it is planted at home, you don't need pesticides, you can only clean up pesticides outside. For most people, you'd better clean them, because you are not sure whether they have pesticides.