You may be able to get an artichoke started again by putting it in water, but these plants flower when they are 4-5 feet high and they require more nutrients to bloom than they will ever get in kitchen water.
An artichoke bottom is the edible fleshy receptacle at the bottom of an artichoke flower.
Actually, a artichoke is a flower bud. The cores of the artichoke stems, which taste like the artichoke heart, are edible if you take off the outside part first.
the flower
artichoke
An artichoke is a plant related to the thistle with enlarged flower heads eaten as a vegetable when immature.
In the Globe Artichoke the flower heads are the part eaten.
Vegetable Flower bud
The booboodara
Artichoke
knotweed
PURE
Depending on the flower they can last several days without water. Hope this helps