I've been hybridizing my Hibiscus plants all summer. I now have a lot of seeds saved. How soon can these be planted? Have any of you tried planting them immediately?

Clint I do, after all if they fall to the ground they usually come up next year.

You can plant them any time but look very carefully at the seeds and see if there are holes in any of them. A moth, I don't remember which one, deposits her eggs in maturing seed pods and the larvae burrow into the developing seeds and eat them from the inside out. As a rule I always put a little bit of diatomaceous earth in with my seeds (all of them, not just hibiscus) and shake well to cover all the seeds .. that will take care of any critters that hatch out.

Xeramtheum said:You can plant them any time but look very carefully at the seeds and see if there are holes in any of them. A moth, I don't remember which one, deposits her eggs in maturing seed pods and the larvae burrow into the developing seeds and eat them from the inside out.

It's a beetle Althaeus hibisci. For me they usually don't emerge from the seed until sometime after I harvest.
https://www.google.com/search?...

I've been able to essentially stop them by putting organza bags over hand pollinated hibiscus.

I started doing that this year and so far no sign of damage.