Now that I’ve made 10 batches of barley koji and I’ve run out of suitable barley it’s time to switch over to making rice koji. 

Instead of wooden trays, I have found that terra cotta bread forms work much better for rice. 

The terra cotta forms are unglazed, so they breath and hold a certain amount of water – just right for rice koji growing, barley koji however, grows better in the wider open wooden trays.