Definition of fireweed
:any of several plants that grow especially in clearings or burned districts: such as
a
:a weedy annual composite (Erechtites hieraciifolia synonym E. hieraciifolius) of eastern North America having flower heads of whitish tubular disk flowers enveloped by green bracts
b
:a tall perennial (Epilobium angustifolium) of the evening-primrose family that has long spikes of pinkish-purple flowers and is an important honey plant in some areas — called also
willow herb
