I grow roselle aka Jamaica which is another variety of hibiscus which is super healthy and absolutely delicious- you have probably tried it ? I first came across it in Mexico where they sold the dried calyxes (which are like folded up immature flowers.) by the sackful in supermarkets. The taste is extraordinary!!! I fell in love with it immediately. It is packed with vitamin c and has a special cooling quality on the body which is probably why so popular down in Mexico!