Where on the stem did it break off? Depending on where, if you can say, you can likely place the whole stem in a cup of water to re-root it; takes a VERY long time, but is doable. I've done it myself, have one doing that now, took about 9 months to get new growth at its base of 2 tubers & roots.

Look around, I believe I posted recent pix to show exactly that.

I just found the thread & brought it back up. Pls. see nearby post called

"How Long Does it Take to Root One of These?"

PriateGirl..I'm not sure how much you can tell from the pictures (cell phone), but this is the end of the stem that broke off.
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And, this is the whole stem.

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If I can root it, do I just put it in water? Do I change the water?

Just stick it in a glass of (room temp.) water so that the bottom 2-4" of the stem are in the water. I don't change the water, I only ADD to it, but I also throw in some bits of charcoal chips (aquarium grade from the pet store) which keeps the water from getting yucky or growing algae.

Will take quite some time so pls. be patient, if you've got a clear vase than you can SEE when it roots, otherwise, just take the stem out to check in a couple of months & then every month or so.

Thanks!! One more question..will it just have roots or will a tuber start too? Reason I'm asking is because if there's going to be a tuber, I don't need to put it in a small mouth vase/container.

Unknown, mine did both -- take a look a the pix on the other thread, I'd allow room or both -- that is avoid narrow necked vase.

First roots, then if you leave it long enough, a tuber. I left one in a narrow vase, broke off the tuber getting it out. :(

Thanks!!!!