大麻は、古より「海水でも祓いきれない穢れを祓う」役割を担った 「祓い清めのツール」として御神事で使われてきた植物です。
今日でも神社のしめ縄などの御飾りに使われていますが、 その事を知っている日本人はほとんどおりません。

大麻にはいくつかの有用な活用法があり、一般的には御存知のように葉の薬理効果が知られています。
日本では大麻の葉を所持しますと大麻取締法で罰せられますが、諸外国では医療に応用されてもいます。

しかし、大麻の本領は、茎の靭皮（じんぴ）を剥がした光り輝やく精麻した繊維の部分にあります。（当然ですが、茎の部位は大麻取締法で取り締まられておりません。）

日本では、この繊維を「精麻（せいま）」と云い、祓い清めのパワーを秘めた大麻の一番大切な部位になります。
大麻飾りは、この精麻だけを用い、根源的な宇宙の光と水、そして大麻を融合させた古来から伝わる神聖な御飾りなのです。

From ancient times, hemp has been used as a purification plant that purifies objects that purified salt water cannot cleanse. It has been used as a “purifying and cleansing” tool for ritual occasions.

Although, hemp is still widely used in special decorations such as Shimenawa that you can find in shrines (rope used to cordon off consecrated areas or as a talisman against evil), not all Japanese people are aware they are made from hemp.

Hemp plant has been utilized in so many different ways, and in general, the pharmacological effect of the leaves is well known to public.
(In Japan, if you posse cannabis, you will be punished by the Cannabis Control Law, however cannabis is used medicinally in some foreign countries.)

The most valuable part of hemp is the brilliant fiber after removing the bast from the stalk.
(Needles to say, the stalks are not controlled by the Cannabis Control Law.)
The hemp fiber is most important part and contains the purifying and cleansing power in Japan.
Hemp ornaments are made from hemp fiber only as a purifying decoration of Yorishiro that combines the universe, light, water and hemp.