What would be the best time to plant the roselle seeds???

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I had a few seeds that were sent to me by a blogger friend from Malaysia, I planted them sometime between February and March last year, don't really remember now. But the point is just one of those seeded well and grew and gave me a few more seeds to plant this year. The question is, when is the best time to plant those seeds so that all seeds germinate well?? A little info for those who do not know what roselle is, its a variety of Hibiscus plant with beautiful pink to white flowers with a dark velvety red centre. The fruits of these plants are dark velvety red and is used in mostly healthy teas and preserves. The leaves of this plant are also used in cooking in many parts of India, they have got a nice sour taste and are used to prepare a variety of dishes like pickles and as side accompaniments with bread and rice.