From plants to animals I’ve always thought that hybrids can’t be reproduced by sexual reproduction. But my suggestion would be to try crossing pollinating a bunch of your plants and see what the outcome is.

One of the problems with pollinating plants is they aren’t always blooming at the same time. So if you get pollen from a flower and have nothing else blooming that may be compatible, you will need to freeze the pollen in something airtight. Pollen doesn‘t last forever. I have never done this with pollen, but I think it’s a fairly common thing to do.

There are any number of plant hybrids that are fertile. Just look at orchids. However, crossing hybrids or even doing a selfing of a hybrid will not necessarily produce offspring which will look like the parent(s).