Answer: Early leaf color change indicates the plant is under stress. Could be environmental stress (weather related) or it could be cultural stress (too much/too little water, etc.). There's not much you can do except watch your plant for symptoms of insect or disease problems, and keep it as healthy as possible by watering it deeply once each week. You might also try pinching out the growing tips to see if that will encourage healthy new growth. If, after pinching, it produces new stems, all is well. If it just sits and sulks, there's a problem with the roots (perhaps soil drainage). Hope it responds well for you after pinching!
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