But growing kombucha itself, I'm just sticking to black/green tea with organic sugar for now. Also, there are some teas that you cannot add to your kombucha (see here), it's mostly tea bags that contain oils that are bad for it.
Interesting. I'd never heard of that, but kombucha was so new at the time (and no internet!), that it was just folks passing along a mother and an outline of how to do it. The only thing that was hard and fast was using white sugar, not honey or any other sort of sweetener. Apparently the critters are very picky about the type of sugar they like.