How to grow a plant that develops its own seeds?

@Thraxa I didn't take it into concideration. But it's good to know! In my first grow season on Mimosa Evo / Laughing Buddha / Purple Punch and Tropicanna Banana. They've all had a few beans. I wonder if they're normal or hermies, hmm. Thanks guys for the explanation!

If she turns Hermie there's always a risk the seeds could be Hermie too. So wouldn't recommend it.

Let it pollinate itself. The easiest way is to let her go longer than usual though this can create alot of seeds.