Where does “Herbstblümchen” come from?

Herbstblümchen (German) comes from German Herbstblume, from German Herbst, from Middle High German herbest, from Old High German herbist, from Proto-West Germanic harbist, from Proto-Germanic harbistaz, from Proto-Germanic harbaz, from Proto-Indo-European kerp- — dung, manure, filth; manure, dung, filth.

Ancestry of “Herbstblümchen”, step by step

StepLanguageWordMeaning
1GermanHerbstblumeautumn flower, fall flower
2GermanHerbstautumn, fall
3Middle High Germanherbest
4Old High Germanherbistautumn, fall
5Proto-West Germanicharbistharvest
6Proto-Germanicharbistazharvest; autumn, fall
7Proto-Germanicharbaz
8Proto-Indo-Europeankerp-to pluck, harvest
9Proto-Indo-European(s)ḱer-dung, manure, filth; manure, dung, filth
Every word from Proto-Indo-European (s)ḱer-Every word from Proto-Indo-European kerp-Every word from Proto-Germanic harbaz