perennate
verb
pe·ren·nate ˈper-ə-ˌnāt 
pə-ˈre-ˌnāt
pə-ˈre-ˌnāt perennated; perennating
intransitive verb
: to live over from one growing season to another
a perennating rhizome
perennation
ˌper-ə-ˈnā-shən
noun 
Word History
Etymology
Latin perennatus, past participle of perennare, from perennis
First Known Use
1904, in the meaning defined above