Answer: Usually, when the differences are so pronounced and in a pattern, there is an environmental reason behind it. For example, cabbages need very rich and evenly moist soil and so root competition from a neighboring tree could cause such a result -- with the effects most pronounced where the roots are more plentiful. Another cause could be that you fertilized one end and not the other, or that your watering is uneven. Surface runoff or soil preparation could also possibly differ from one end of the row to the other. With a little detective work, you should be able to figure out what is causing the stunting.
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