Posted: 21/02/2015 at 18:13
GG..........Hibiscus used to self seed like mad for me in France. They would flower profusely, drop seeds and then seedlings would appear in Spring. We used to get some fairly hard frosts there so I would imagine that a cold period helps them.
I brought seedlings back to the UK with me but the trees are still too small to flower as yet but yours should germinate in a cold g/h or frame here I imagine.