WordNet sense 1 (of or relating to an activity that is passive and monotonous):

vegetive

WordNet sense 2 (controlled by the autonomic nervous system; without conscious control):

involuntary

WordNet sense 3 ((of reproduction) characterized by asexual processes):

vegetal

WordNet sense 4 (not having or involving sex):

asexual, nonsexual

WordNet sense 5 (composed of vegetation or plants):

vegetational

WordNet sense 6 (of the nature of or characteristic of or derived from plants):

vegetable