I planted asparagus this year, and I have used a water permeable weed barrier to control weeds. But this does not seem like a good idea going forward, as I don't want to discourage the spread of the asparagus to other areas of the bed.
My father used to sprinkle salt water on his asparagus, but that is not considered a good idea by many experts. The reasons are listed here
Hoeing seems like it would disturb the roots and possibly damage the crowns.
What methods or techniques are best for controlling weeds in an asparagus bed?