Laurie, too bad I didn't see this earlier, I have kept a Deiffenbachia going for about 22 years, my Mom gave me the original plant. Over the years when the plant got too tall I would cut it off and root the top, leave the stem in the pot and you end up with 2 plants or more, then I found out that I could also get a plant form a 6 or 7 inch piece of the stalk. I just cut one plant down that was over 6 feet tall, it still looked good but was falling over, that's happens fairly often.
After a few weeks in water the part of the leaf left on the bottom of the stem gets mushy, I carefully pull that off and wash the plant gently, I did that just today and changed the water, and it looks like I am getting a root.
When you pot it put it in a big pot or it will outgrow it very quickly as the leaves get huge and it will fall over. I use Pro Mix, I think it is BX, I get the bale so I always have lots on hand.
A few photos of the stalk and what I cleaned off.
My other plant has 3 plants that I started from cuttings, I have given away many plants that came form the mother plant.
Probably a lot more than you wanted to know.
