

My china doll house plant was doing really well, so well that we repotted it (not knowing that they like to be root bound) it seemed to be fine. However, it has grown to about 3ft...it's been in the same pot for about 2 years and now it has lost all of its leaves except on the top, so we have this tall, spindly stem with no branches or leaves and then a clump of branches and leaves on top. My question is how far back can we prune this plant without killing it to propagate a bushier plant again?