Answer: I think you're on the right track when you suspect there's an environmental problem or a soil problem. It's unusual for a row of similar plants to perform differently from one plant to another. I'd dig one up and check the root system; look for rodent damage or disease. Healthy roots should be creamy white inside; diseased roots will be brown or rusty colored. Look for gnawed or missing roots, etc. I think you'll determine the cause after inspecting the root systems. Best wishes with your garden!
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