Answer: Excess sun usually causes a tan or yellow type of discoloration along with possibly wilting, I would not expect it to turn black as a result of sun. Also, this plant can tolerate full sun if the soil if evenly moist during the establishment phase. This plant is potentially subject to a number of fungal and bacterial infections, some carried in the soil, so I would suggest you work with your professionally certified nurseryman and/or your local county extension to obtain a specific diagnosis of what is affecting your plant. I hope it is nothing too serious.
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