Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of flavonoids.
Synonyms:
exact_synonym:
positive regulation of flavonoid anabolism; positive regulation of flavonoid biosynthesis; positive regulation of flavonoid formation; positive regulation of flavonoid synthesis; up regulation of flavonoid biosynthetic process; upregulation of flavonoid biosynthetic process
narrow_synonym:
activation of flavonoid biosynthetic process; stimulation of flavonoid biosynthetic process