Ferns are ancient plants. They predate flowering plants. You can find fossils of them in the carboniferous era. They propagate, not by seed, but by spores which are held on the underside of the leaves. In sporediea. They are discharged into the air and are blown away by the wind. From there they create tiny ferns, I can’t remember the exact details because its over forty years since I learnt about them. All I can say is I must look it up. I do know they have silica in their cells and can be toxic to cattle and sheep.
Ferns are beautiful, they have lovely spiral fronds which then unfurl. There are different colours shapes and sizes. I know that some people have gardens full of ferns. I obviously need to find out more.