I've read all the posts here (and on other sites) that I can find on growing Kohleria. What I can't find is what size pot to use and when to pot up - or if you pot up. Best I can find is that they seem to prefer to be in a small pot - but not sure how small that is.

I put several rhizomes in a 4" pot and they are all growing, but it seems a bit crowded. I also just was given a few young plants - they are in 2" pots and are about 6" tall, with leaves that are at least 5 to 6" long - it seems they are way underpotted...but I don't know for sure.

Any help is appreciated.