From Longman Dictionary of Contemporary Englishroot something ↔ up phrasal verbDLGto dig or pull a plant up with its roots → root→ See Verb table
Examples from the Corpus
root up• Eventually the roots will give up.• The bigger the difference in shade between your own natural colouring and the new, the more your roots will show up.• He pointed to a fresh cut on a scrawny root sticking up through the dust. 