Plants with different growth stages

I know it is possible to do this kind of procedure, but it seems very complex for a French noob like me.

A nice feature would be blocks with different growth stages. like plants and crops like wheat, carrots, potatoes or beets. the ability to tell it how many ticks to wait until it grows for each stage or put it on a randomizer. or even multi-block height stages so you can grow 2 high growth stages in blocks to use a theoretical corn crop that would be taller.

Of course, these plants would automatically grow on farmland, but giving the option not to do so would make the situation even better. like the side of a block like cocoa beans on trees for example.