From Longman Dictionary of Contemporary Englishgrub something ↔ up/out phrasal verbDIGto dig plants out of the ground Farmers were encouraged to grub up hedgerows. → grub→ See Verb table
Examples from the Corpus
grub up/out• Depending on how close it is to successful neighbours and the risk of root disturbance, grub the rootstock out.• Good arable farmers grubbed them up.• He and the rest of the Grill regulars would gladly grub the stumps out of the town lot with their own hands. 