Hibiscus seeds

I ordered seeds for hybrid hibiscus, the advice was to soak them for 8 hours and I think I did read something to file some of the seed shell down? I'm a pretty decent gardener. Any tips on the soil or planting them please. Thanks

Hadley, PA(Zone 5a)

Are they hardy or tropical hibiscus seeds? For the hardy types which have spherical seeds, I usually just soak them overnight and they pop up quite quickly after being planted. For tropical hibiscus seeds which have more of a kidney shape, I sometimes nick a little chip out of the rounded side before soaking them. Of, if they are too small to be chipped, I may soak them in hot water (about 140 degrees) briefly. Hope this helps!

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