annual 6 Associations

one-year biennial (antonym) perennial (antonym)

biennial 8 Associations

two-year perennial (antonym) annual (antonym)

perennial 9 Associations

annual (antonym) biennial (antonym)

perennial 9 Associations

long (similar term)

perennial 9 Associations

recurrent repeated continual (similar term)

perennial 9 Associations

plant (generic term) flora (generic term) plant life (generic term)