My hibiscus plant has blooms but the leaves are turning yellow and curled. It does not look healthy. What can I do to make it healthy? When I bought the plant, the leaves were little bit curled up and I thought it was due to the winter season in California. Later I noticed some aphids on the leaves. There was a ladybug sitting on the leaves and eating the aphids too. The aphids were kind of black in color. I repotted the plant, and watered it when needed. Now it looks very unhealthy. I am thinking of taking the plant to Lowes where I bought the plant. If they don't take the plant, I don't know how to save it. Please help.