Asparagus should be cleaned up in the beginning of March at the latest in our area. The reason being is that new shoots start coming up, for this year's picking, and cleaning the bed later makes it harder. Your shoots won't be as green as they can be because last year's stems will block the sun from the new shoots.
Here is a look at my asparagus from a few days ago. I had to clean it up slowly as not to break or smash the new shoots.
|Last Year's Asparagus Plants - The Rusted Garden: Gary Pilarchik|
|Clearing it Reveals the New Asparagus Shoots: Gary Pilarchik|
|Cleared Asparagus Bed: Gary Pilarchik|
|Asparagus Clump One: Gary Pilarchik|
|Asparagus Clump Two: Gary Pilarchik|
|Asparagus Clump Three: Gary Pilarchik|