Mary
I'm in NY and have Texas star hibiscus growing here for the last few years. Take a few seeds, soak them over night, and plant the seeds less than 1/4 inch into a pot or cell pack. If they don't germinate in a few weeks, that could mean the seeds are old. If they do germinate, keep them potted up til early fall, then plant in the ground, mulch well over the winter, removing mulch in the late spring. They will be one of the last hardy hibscus to come up in the spring. Hope that helps.
Alberta

I have found that putting the seeds in a bowl and adding BOILING water to it then let it sit for a few days untouched everyone of the seeds will spout, I usally pot them until I think they are ready for outside.

utexas.edu - Anisacanthus wrightii Flame Acanthus

"By seed. Sow stratified seed 1/2 - 1/3" deep in Spring, or direct sow in Fall."

Alberta, seems to need a moist cold period before it will germinate