Soak seed in water overnight then use a fungicidal rinse. Lightly cover the seed.... soil temp 70-80F for germination. Takes 7-10 days to germinate. takes 8-10 weeks till large enough to set out.....

Thank you for the info. I soaked the seeds but did not use a fungiside, could the seeds still be healthy? Thank you

I know this post is old, but if people are still reading I figured it wouldn't hurt to add my experience. I've read a few articles that give a labor intensive list of things that need to be done to propagate Hibiscus, (scarification then stratification for 90 days) but honestly they haven't been that difficult to get started. I just planted some new coccineus and grandiflorus seeds (gotten from florida wildflower coop) 3 days ago. I scarified them with a hemostat and nail file until I could just barely see pale green/white, and put them in jiffy peat pellets soaked in rainwater (not tap!). The temperature is around 80 degrees lately. There were quite a few seeds that crumbled while I was scarifying, so make sure the seeds you are using are viable! Out of the 72 pots that I planted 3 days ago, 12 already have little plants starting to poke out. Make sure to keep them wet, they like a lot of moisture :)