1.   Because the ground is tilled less often, the weeds that show up there tend to be perennials.

2.   But then the plan was only to till the ground for video.

3.   Even as the fighting continues, opium farmers are returning to their fields, tilling the ground for what had been their most reliable cash crop.

4.   The now-kaput, pure-play Internet companies essentially tilled the ground for the traditional supermarket chains.