Roselle (Hibiscus sabdariffa) took over my garden this year. I had two plants from Vilardi Gardens and didn't realize how big they would get, but I love them! Not to be confused with tropical hibiscus, this is also known as Jamaican Sorrel and in my garden grew to be about 4 feet tall and wide. Both the flowers and buds are striking.
Before growing hibiscus, I thought that the vivid-hued jamaica I often drink in Mexican restaurants was made from the dried flowers. It's actually steeped from the calyxes which encase the seed pod. The pod is removed and then the calyxes dried.