Comes back every year --perennial

from www.wordsmith.org

perennial (puh-REN-ee-uhl) adjective
1. Lasting for a long time; perpetual.
2. (of a plant) Living several years.
3. Recurrent.
noun
1. A perennial plant.
2. Something that continues or is recurrent.

[From Latin perennis (through the year), from per- (throughout) + annus (year). Ultimately from Indo-European root at- (to go) that is also the source of annual, annals, annuity, and anniversary.]

"The city is mounting an unprecedented war on the perennial plague."
-- Brian Bergman; Mosquitoes to Bite it in Winnipeg; Maclean's (Toronto, Canada); May 20, 2002.

"Summer harvests of vegetable and fruit crops are maturing quicker and cropping later, while spring-flowering shrubs, annuals, and perennials are growing faster through the winter and coming into bloom sooner."
-- Paul Healy; A Warming Welcome; The Mercury (Hobart, Tasmania, Australia); Jun 8, 2002.