Salad Hibiscus, Sleepy Hibiscus. Vinous flowers open in the morning, and by 3-4 pm they convolve into a curious fico-like knot. Flowers cover the bush several times a year. Very similar to acetosella, this edible hibiscus is great for salads, rich of vitamin C. Seeds are used for making delicious tea. Very fast growing, form a large bush. Tolerates dry conditions. Grow your edible landscape in no time!