End Iron Plant

Some sort of Plant in the End dimension that is made out of Iron and can be farmed.

To replace iron farms.

This could be grass, that because it's made out of iron, will cut you if you walk across it and you'll take damage.

It could also be a tree that breaks like the chorus plant and drops iron.

Because this is a plant you could use bone meal to make it grow faster.

You could even make a mob that poops iron like chickens poop eggs.