@humbertovitorino
Hello Humberto,
I've been growing some for just about the same length of time, but only Achimenes mostly - along with a couple of Eucodonias and some hybrids between those and Smithianthas. I've never tried a Kohleria. If you have some, post some photos. I'd love to see them. Mine are running really late in beginning bloom this year. I think some are probably going to skip blooming. The plant growth has been really good, but they aren't producing many blooms so far.