These are genuine high-quality koji starters from Hishiroku, Kyoto. We are a Hishiroku-authorised koji spore distributor and are directly sourcing starters from them and storing them in the optimum condition until they are shipped out to you.
Hishiroku is one of the oldest koji starter producer and having been producing koji spores at least 350 years. Hishiroku is also one of only 6 spore producers in Japan and over 99% of breweries in Japan are totally dependent on them as the quality of spores determines the taste and flavours of final ferments (sake, miso, shoyu, name a few).
Mr Sukeno, the current president of the company is very supportive and we often consult with him whenever questions arise regarding to the koji making. Before Covid-19, Hishiroku hosted annual koji making workshops which is not surprisingly extremely popular and sought after. In the past many overseas attendants thoroughly enjoyed the opportunity.