Where does “жълт смил” come from?

жълт смил (Bulgarian) comes from Bulgarian жълт, from Old Church Slavonic жлътъ, from Proto-Slavic žьltъ, from Proto-Balto-Slavic gilˀtas, from Proto-Indo-European ǵʰelh₃- — to flourish; green, yellow.

Ancestry of “жълт смил”, step by step

жълт смил traces back through two separate lines of ancestry.

via Bulgarian жълт

StepLanguageWordMeaning
1Bulgarianжълтyellow (having a yellow colour), wheaten
2Old Church Slavonicжлътъyellow
3Proto-Slavicžьltъyellow
4Proto-Balto-Slavicgilˀtasyellow
5Proto-Indo-Europeanǵʰelh₃-to flourish; green, yellow

via Bulgarian смил

StepLanguageWordMeaning
1Bulgarianсмилdwarf everlast (Helichrysum arenarium)
Every word from Proto-Indo-European ǵʰelh₃-Every word from Proto-Balto-Slavic gilˀtasEvery word from Proto-Slavic žьltъ