JoeSpareBedroom wrote:

Around here (Western NY), coleus plants issue painful visual warnings when
the temps get close to 32 at night. The warnings mean "You should've taken
cuttings yesterday". :-) Below 32, they're history, and they get ugly,
fast. Very tender plants. If the weather report suggests that you're about
to get temps that low, and then not again for a month, you could use some
heavy plastic to create a tent over the plants just for that one "event".
Make sure there are a few inches between the leaves and the plastic. Be sure
to remove it before the sun shines on it for very long in the morning, or
you might cook the plants.

But by far the best way to deal with tender coleus plants is to plant
them in containers. Move them in when it's cold, put them back out in
warm weather. Coleus cuttings root great in containers anyway, so create
containerized arrays (remembering that bright coleus need more sun than
dark coleus do).