Ed, I try to wait until the middle of winter. Then I burn it off. The
ashes help the asparagus and the fire kills any seeds waiting to germinate.
If you rototill it, you will bury the seeds and will need to use a
pre-emergent in the spring.
Another trick that worked was to cover the asparagus spears in the spring,
with paper cups, and spray the bed with round up. If you are bothered with
crabgrass, use a crabgrass killer like Over The Top".
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