The best way to get a thick trunk on a Ficus where you are is to start with
a bigger Ficus. why wait for a small plant to get big to cut it way back.
Makes better sense to start with a bigger plant that has a thicker trunk.
Sometimes nurseries in my area have sales on large Ficus when they get leggy. these
are good for bonsai. they are perfect material.
Just make sure that when you start cutting it back that you keep leaves at
the highest point of the plant or you can lose entire branches above your
highest leaves. Ficus need leaves to draw food if there is no leaves that branch
dies. Ficus are easy otherwise.

SteveW

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