Your title says tilling weeds and the message says grass. Left on the soil, grass roots will try to re-establish themselves. Some weeds act as though tilling were a means of propagation: each bit of root starts up a new plant. Therefore, rake up and remove what you can. Toss it into the compost pile. Watch for return of the weeds so you can pull them while still small.
Answered on April 26, 2018
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