Answer: Unfortunately I have not found any references to a hibiscus "Simple Love" or to a cultivated hardy perennial hibiscus with yellow blooms.
Is it possible that you bought Hibiscus aculeatus, a perennial wildflower native to the southern gulf states from Texas to Florida and north into North Carolina. This plant is rated hardy in zones 7 to 9 and requires a very moist soil. There is a photo of the flower at the following web page. (You may need to cut and paste the url to make it work right.)
If this is the case, I would not expect it to be perennial for you but if it managed to survive the winter it might be delayed in coming up this spring. You might also want to check back with the supplier and ask them what you might realistically expect. I'm sorry I can't be more helpful.
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