Asparagus can be cut down now or left until spring. It needs removed before new growth. I usually knock it down with the riding mower and burn it. Last year, I put wood chip mulch over the bed to keep weeds down. It worked well. However, I don't want to set the wood chips on fire. This year, I will use the blade on my string trimmer and cut them off and chop the fern growth up for mulch.
