you planted "crowns"? - a root mass?
one can buy 2 or 3 year old crowns.
it takes time for asparagus to get established -
using 2 year old crowns,
plant, do not harvest anything for 2 years
3rd year you can take the early stalks; leave the later stalks grow & fern out
if you start with three year old crowns, you can lightly harvest the second year.
it is essential to let the later spears grow into the fern-ie foliage - that's the bit that feeds the roots & makes the plant grow / stronger.
traditionally they would be planted a bit deeper, manure at the bottom, etc.
basically it takes 5 years (starting with 2 yr crowns - or 4 yrs with 3 yr crowns) to get a patch going for harvest - regardless you cannot harvest every spear that comes up or you'll kill the roots.
on the upside, once established an asparagus patch will produce for many years - as in 10+