Posted: 18/04/2013 at 15:53
Are they from seed? I'd plant them out before it gets too late. Make sure you prepare the bed first very, very well with plenty of compost and organic material. Asparagus beds are long-term propositions. Once the asparagus is in situ you won't get another chance to improve the soil beyond top-dressing.
Let the ferns grow up in this first season. Don't harvest anything. If the spot is exposed, you might need to support them.