Hello, happy day.
I am so glad to know that this post can be of help to those who grow their plants like me.
My mom was a fan of planting any number of species in her garden, and she taught me that I should let the seeds dry before planting them... that way it was safer for them to sprout, than planting them fresh. And the hibiscus seedlings sprouted very quickly. I am happy about that.
Best regards!