@mismi,
Hello Mismi,..I planted six asparagus roots, three years back, in the spring, and by fall, there were ten to fifteen very thin (an eighth of an inch, to three sixteenths diameter) aspargus, four feet tall, and they had gone to seed, Year two,...tripled that amount from each root,...now I had six areas with thirty to forty asparagus's, a bit thicker,...and I did harvest a few,..but, mainly, wanted them to go to seed . From this year on, all it will do is continue to multiply.
Here is a picture I found online.