Hello all.

Here are a few updated comments in response to questions:

The soil doesn't smell foul at all. The pot has holes in it, and the
soil seems to drain very well. It is hard for me to pull these
dracenae marginata out of this large pot to repot them, but I did yank
them part of the way out a few months ago and added a pretty good
amount of fresh soil. At that time I was able to determine that the
roots are not root-bound. I have not observed any difference in the
growth pattern or overall health of the plant since I added the new
soil.

There is a large window (2.5" wide x 6" high) right next to this
plant, but we keep the blinds on this window about half-closed most of
the time, so this plant doesn't get much direct sun (except for the
bits that seep through the slats in the blinds). There are a whole
bunch of other light sources in this room (such as two sliding glass
doors), and the room is generally what any reasonable person would
consider "bright," but this plant doesn't get any bright direct light
from any source.

There are a bunch of VERY healthy dracenae warnecki in this same pot,
so apparently the light/soil/moisture conditions are about perfect for
that member of the dracenae family.

Chuck