Asparagus plug plants

Iv'e been offered some asparagus plugs and would like to know how long it will be before i can harvest from them. Are they the same as crowns in that you pick nothing for the first year etc, or would they be way behind crowns.

They are in effect a year behind 1 year-old crowns so you would need to wait 2 years before taking a small crop.

Some people may have done better than I have but in my experience it takes around 5 years for asparagus beds to really establish themselves so patience is required whichever route you go down!