It's that time again, starting at the lower zones. Keep an eye on your forecast and if you want to snip cuttings from Coleus in the ground, the chances of success are better if done before lows drop much below 50° for more than 1 night.
If you decide later it was too soon and want to do new snips, no reason not to. You can always chop as much off of the top as you want to keep a Coleus small while inside if needed.
Winter is also a great time to practice bonsai trimming techniques on Coleus plants. The rapid pace of the growth yields quickly observable results.
My success rate remains well above 90% in water or soil, when putting at least 4" of stem in water or soil, (leaves removed from that area), then making sure they don't get too dry. Plenty of sun.
A lot of other cute little plants can be done the same way if they are also tender perennials, not true annuals.