Poinsetta care

Last January I rescued a poinsetta that was being ignored and left to die here at work. It had dropped all its leaves and had nothing but some shrivelled red petals on it.

I just started watering it, and in about 6 weeks it had sprouted plenty of new green leaves, and a new flush of red petals. By summer it had a very nice flush of leaves.

The source I looked at said that the flowers would die back in early to mid summer, and at that point I should crop it back to about 6 inches so it could push out new growth.

Thing is, it's just continuing as-is. It's bushy now, and the red petals never died, but they faded. There's new growth underneath.

I think I'm going to chop the top few inches off all the old growth and see what happens. I'll probably dump in some fertilizer - since they prefer acid soil, I'll probably bring in a little hollytone from home, and maybe a little time-release stuff too for general nutrition.

Any opinions? I probably should have done all this a month or more ago, but I guess we'll see what happens.