David, don't forget that Coleus also start very easily from cuttings. That's the way to ensure you keep the types you are currently growing, if you particularly like them. Seedlings will not necessarily come true to the mother plant.
I took cuttings to my daughter's house in Salt Lake City in November, and she says they are "huge" now, with snow on the ground outside here nice big, south-facing window. They do keep their heat on all the time, though. New baby in the house.
She also said that the cats have knocked the plants off the windowsill a few times, and broken pieces off. She just puts them in a jar of water, and now has several new plants rooting in the water. It only takes about a week if it's warm for roots to start forming.
This is one plant started from a cutting last fall, maybe September. I've had to 'prune' it a few times just to keep the pot from tipping over.
