Why is it not recommended to pick the outer leaves of cabbage when growing?

When growing cabbage, the outer leaves should not be removed for several reasons. The very first and most insignificant reason is that the head of cabbage, which will later be eaten, does not get dirty with dirt, dust and other unnecessary substances do not settle on it. The more important reason is the photosynthesis of the plant. Thanks to these large leaves, the cabbage gets all the nutrients it needs. If you remove them, then other leaves, which are smaller and which are not open, will photosynthesize. This will affect the quality of the crop.