Question: Hi, the leaves of my supertunias are turning yellow from the center outward. This is the first time I have used Mir Gro moist control soil, usually use Mir Grow reg potting soil. Could that be the prob? Or too much water, but I don't think I have overwatered. They are in in a coconut fiber basket, north central KY. Have always done great in past yrs. Should I use some type of food/fert?Thanks.
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