What is HISHI?

HISHI is a seaweed of the therophyte which grows gregariously in the reservoir
and swamp of the Japan whole country.
An aquatic plant has a function which improves water quality.

However, an aquatic plant will carry out serious proliferation by drainage from the household
it is becomes the cause of worsening water quality.
Moreover, the fruit of HISHI can be eaten.
An ingredient called 「erabu」 and 「tannin」 is contained in the fruit of HISHI
HISHI is told to be effective against the cancer prevention, a digesting effect, a hangover by these.