Asparagus.........again

Hi,  I know similar threads have been brought up before but I found them unclear.

We bought 2 year old asparagus crowns in March.  Planted them as prescribed and everyone has come up and developed at least 12 inches of fern.  All good.

My question is do I need to prune the ferns down in the winter and is that classed as the first years growth?  Meaning next year would I be able to harvest say a spear per plant or should I leave it alone?

Any advice appreciated, thanks.

Thanks MoS. I wasn't sure if cutting it down was just done with existing crops whilst a new bed needed time to build up its energy reserves.  Seems like both  .