Webthe wisteria flowers are a little harmful to humans, but they are poison for the demons.

A normal dosage of the poison made from the flowers can stop a demon’s.

Webokay so throughout the show and manga, it’s been told that the sun and slicing demons’ heads off with the nichirin material (the nichirin blade doesn’t work on muzan though).

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By growing wisteria flowers or burning wisteria incense around a house, one can ward off demons that would harm them.

Webas others have said, incense would be the best bet as wisteria is a vine that takes years to mature.

Probably less effective against upper moons and muzan, but regardless.

I'm gonna answer your question one by one and in case you haven't read all.

Webyou could just make wisteria perfume, and it will be incredibly effective against most of the demons.

Gyomei always burned wisteria incense.

Webmount fujikasane (藤 (ふじ) 襲 (かさね) 山 (やま) , fujikasane yama?), is a mountain full of wisteria blooming every season from the mountain's foot to its slope.

Webwhen concentrated, the smell of the wisteria flower is an excellent demon repellent.

Webthe reason shinobu kocho uses wisteria poison to fight demons is because she lacks the physical strength required to behead a demon, even her student.

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