One problem is the glut of year-round imported asparagus
Up here in Canada anyway, where just a few years ago asparagus was still a springtime treat. Now you can get it year-round from Peru and Mexico (even though it's as tasteless as year-round strawberries and year-round rhubarb) a lot of Ontario farmers don't have the market they used to and switch to other products. I guess a lot of consumers don't care too much about the taste of what they eat, or its provenance, or the benefits of eating local food. (Don't get me preachin' ...!)