Answer: Quite often the new growth on barberry shrubs starts out pink and then turns a deeper, crimson-like color as the season progresses. Could the leaves on that one shrub be brand new? If so, it indicates some kind of stress which made all the older leaves fall off. Perhaps poorly draining soil? Maybe too much or too little water? A late frost? It's hard to guess what the problem might be. As long as the stems and branches are alive, the plant is probably healthy, and capable of recovering from whatever made it act so strange. I'd give it the rest of the season to straighten up and grow right. If it continues to look bad, or if it gets worse, maybe the only answer is to dig it up and replace it with a healthy specimen. Good luck with your shrub!
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