As I understand it, asparagus cannot be harvested the first 2 years,can be aggressive, and is used as a ornamental where people have the room.

I planted some years ago for the foliage.
It's still a small clump and each spring I break off the spears as they come up and eat them raw.

I grow mine in a 30 + gal. pot because I don't have room for it to "expand". The foliage is nice as a texture change.
I also grow fennel and dill for the foliage to feed the butterfly wormies.

I have a very healthy clump that dies back in winter and returns every spring. I do not harvest it to cook but occasionally eat a raw spear like ruthz does. I did not plant it. It just volunteered from another plant that I long ago got rid of.

It gets almost 4 feet tall and then cascades down in a circle. I do not give it any special care, just a few squirts of water sometimes.