Gosh, I am really dumb on this topic. They are not nearly big enough to cut for eating. Do they require large amounts of water? Tell more please.
How long has it been in the ground? Did you start with roots or seeds? Mine has been in the garden for a long time...10 to 15 years minimum. I harvest as soon as the stalks get close to a foot tall and keep harvesting daily until it slows down significantly. Then I let the stalks grow and leave them alone and let them go to seed as you want them to do that in order to continue to be productive in subsequent years. Here is a link that has some good info on how to grow/harvest asparagus that might be helpful.
Growing asparagus in Minnesota home gardens : Vegetables : Yard and Garden : University of Minnesota Extension