It's considered an annual in all areas except zones 7-9. I wouldn't plant divisions until it warms up more and chance of frost is past.

Inevitably the roots will have to be cut for the division, but I wouldn't cut any more than necessary. As far as the top growth, I would cut it back to about 6 inches.

You could divide it now so the new roots could get a head start. Put them in a South facing window or under some lights.

Thanks for your help Gawdinfever. I'll divide this tomorrow.

Would now be a good time to try cuttings again since I will be cutting off so much top growth? Anyone have any good suggestions for me? (I've never been able to successfully propagate by cuttings.)

You could, but since you say the top is lanky growth from being inside, you might have better success after the plant is brought back to a healthy state and actively growing again.

When you take your cuttings, are you using a rooting hormone?

I've taken about 30 cuttings, and tried several different ways to get them to root. Some in tap water, some in distilled water, some in weak tea. Also used potting soil, rooting hormone, jiffy pellets, bottom heat, humidity domes, warm kitchen, cool basement, misting, etc. Then I tried different variations of the above.

Pretty anal, huh? I have 1 cutting left alive - the one I put in an old Yoplait container in plain tap water with no bottom heat and no humidity dome!

You made a really interesting comment Gawdinfever... it struck me that the only common demoninator I can come up with is that all the cuttings were taken off of weak winter growth, with the nodes spaced out about 5" apart. Do you think this could be part of my problem?

I do. I myself, had experienced that.

Also, some plants just root so much better when the plant is in the 'growth mode'.

gawdenfever is correct. Using the weak cuttings as you have been doing is practically impossible to get any to root. Wait until your plant is producing stems with a stiffness to them before taking cuttings. Al

The stems don't usually stiffen up until I move this plant outside in mid-May. I'll take some cuttings then.

One last question... any idea when my May cuttings would actually bloom? (If it's not until September, I don't think I would bother.)

They have tuberous roots like a Dahlia and you can just let them go completely dormant in the winter when you bring them inside. They will start to grow again when you water them in late winter or spring.

I have had great luck doing root cuttings. Just pot them
up in good potting soil. Try to place them vertically
in the pot,but they will grow even if placed horizontally.
Keep them in a south window and keep the soil moist, but
not wet