Dig over
Definition 1 of 2
Pro Tip 1/3Gardening Context
Used when referring to the preparation of soil for planting by turning it over. 
Before we can plant any seeds, we need to dig over the garden bed.
Pro Tip 2/3Physical Effort
Implies a physical activity involving some level of exertion. 
You'll feel it in your back after you've been digging over the yard all day.
Pro Tip 3/3Seasonal Activity
Commonly done as part of seasonal gardening, especially during spring or autumn. 
It's autumn, so it's time to dig over the flower beds to prepare for winter.