Thank's Carrust,
As far as I know, the ones commonly grown are perennials, which are from warmer climates, but are usually treated as annuals in colder climates like the UK.
Confused?, me too.
As it's vegative propagation, you want from the cutting, you will get an exact clone from the cutting, if you propagate from seed, you may get a variation, depending on cross-pollination.
with the correct care and a little green fingered luck, you should be able to manage a coleus as a perennial indoors . Good luck...Chip