I have had the same batch of Asparagus in my garden for 8 years and have had
great yields every spring. Last spring  none of my asparagus came up.
I attributed it to an extremely wet/rainy March in Northern California.
I let it pass and this year nothing came up again. It appears that I have
lost all of my original 22 plants. What could have happened to them during
the winter of 2005-2006? All of them? I fertilize and cover them for cold
protection every year.