Where does “frostweed” come from?

frostweed (English) comes from English weed, from Middle English weed, from Old English wēod, from Proto-West Germanic *weud — weed (unwanted plant).

frostweed (English): An American species of rockrose; Verbesina...

Definitions

  1. An American species of rockrose; Verbesina...

Ancestry of “frostweed”, step by step

frostweed traces back through two separate lines of ancestry.

via English weed

StepLanguageWordMeaning
1EnglishweedAny plant regarded as unwanted at the place...
2Middle Englishweed
3Old Englishwēodweed
4Proto-West Germanic*weudweed (unwanted plant)

via English frost

StepLanguageWordMeaning
1EnglishfrostA cover of minute ice crystals on objects that...
2Middle EnglishfrostCold, freezing, or frosty weather; weather that...
3Old Englishfrostproduced by metathesis
4Proto-Indo-Europeanprustósfrost
Every word from Proto-West Germanic *weudEvery word from Old English wēodEvery word from Middle English weed