Yellowing leaves is an indication of plant stress, such as overwatering or pests. I would check the soil to make sure that it's not too moist. Also, check for any insect pests. For more information on what causes yellow leaves and to help pinpoint the cause in yours, this article will help: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm
Answered on June 23, 2015
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