IDK about hibiscus but stains from teas and such added to henna are not permanent. Some herbs leave permanent stains but from my experience, most do not.I mixed my third henna treatment with Hibiscus and I love the results but every time I was my hair I see red color still coming out. It must be the hibiscus because I'm sure I rinse it out correctly. I've been using Jamila hair henna which is only $1.79 a box at my local Indian store; I know BOA is better but I can't bring myself to pay a lot more plus shipping.
I wish I had an Indian store near me. I like the results of BAQ henna and don't mind spending a little more for it, but I'd prefer to buy henna locally. Some Indian stores I'm sure probably carry BAQ henna, too.