Asparagus crowns

I planted a couple of asparagus crowns in October last year, followed instructions etc with regards to depth, plenty of well-rotten manure and spreading out the roots, but there's absolutely no sign of life! I know it's been a very cold spring but thought there should be something making an appearance by now?

Any ideas what I've done wrong?

WF is almost certainly right; could you add your general location to your forum profile in case there's anything climate-specific to your location which we can advise on?

OK, thanks for your replies - I've got a lot more confidence in them now! 

I live in Lancashire, and it has been quite chilly here up until the last couple of days, so fingers crossed they might poke through soon! 

Mine were new at the start of last year and most (21 out of 24) grew. There's no sign of them yet this year. It's just a slow start this year.

I was down at the plot yesterday. The first spears of year two have appeared. I now need to find something to do for the next six weeks so I don't try and take any.