the 'leggy' problem
That stem may have started to grow leggy because your schefflera
may not be getting enough light. If that is the case, the other
stems may start to lean toward the light and drop their lower
Scheffleras are best in very bright, indirect sun.
An east-facing window, or just back from a south- or west-facing
window is ideal.
If possible, move your plant into brighter light and rotate it
every few days so that all sides of the plant are exposed to as
much light as possible.
This helps all the stems grow more
evenly. You can also use grow lights positioned directly above
the plant to encourage it to grow more upright. If you use grow
lights, keep them on for about 12 hours a day.
Schefflera bonsai created
through careful pruning
Island Pines indoors
Cutting-back overgrown Yews