I've been told that the best tool to dig up an old bed and reset the crowns is a backhoe! I don't have one, so my 20 yr bed just putters along. Some crowns seem to be better at making thick spears than others.
It is important to clean up any red berries at the end of the year both to prevent volunteers from adding in, but also to reduce your asparagus beetle burden (the larvae overwinter in them). I had problems with them for a few years but after paying attention to this they have not been an issue.
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