I purchased a lovely pale yellow hibiscus 2 years ago and it has delighted me with growth and blooms. Right now, however, I am concerned about its health. The larger leaves on the plant are curling inward and appear darker on their edges. I fertilize monthly and provide plenty of water. It faces east and receives 6 hours of sun daily. Does this sound like a pest, disease, fertilization or watering problem? For some reason I am unable to upload a photo....but, I will not give up! Thank you for sharing your knowledge with me.