"Even tho it looks good doesn’t mean it is good!"

Really?

They will grow from cuttings, if you want a smaller plant.

Thanks for your suggestion😜

It looks great. These things are, in my opinion, among the list of fairly indestructible plants. Unless you truly want to put the whole plant in a different pot, either break or (literally) saw a big piece (or two...or three) off, then put it/them in big enough jar(s) full of water (Mason jars work well). It'll root like crazy in a few weeks (or less) and then you can either plant it back in the same pot (if not already overcrowded with stems) or put in a new pot. I think the trickiest part is sometimes getting the rooted piece out of the jar without breaking some of the newly developed roots if you wait too long, since the roots grow fast in water but can break off the stem pretty easily.

As to repotting your entire plant, my experience is that you can do it anytime. It's a pretty forgiving plant. I've done this and have always noticed that they don't develop real extensive root systems compared to some plants - but rather the roots tend to stay rather close to within a few inches of the pot surface. At least I think I'm right about this - haven't transplanted an entire dieffenbachia in quite a few years.

Does your pot have drainage holes? As for draining nearly any plant, due to back problems I gave up on trying to lift mine into a tray that I use to let plants drip through, and so have my dieffenbachia on a saucer (pot has drainage holes in it) and then I just suck the water out of the saucer with a baster when it's done dripping. I do this with all my bigger plants rather than have to lift them.

I don't think you need to worry about knowing the history of this - when it was potted, in what soil, etc. Just go after it. You can certainly take the whole plant out of the pot and transplant, but I'd rather just start new ones by rooting in water. That way, you don't have to worry about root rot due to transplant shock. These put out multiple stems as you already know, so if the pot either gets too full or the tallest stems start to fall over (I think this is the biggest problem), even if you don't want to start new ones just break a few off that keep falling over and then new shoots will come off where you broke a piece. It always goes against me to trash the long, big pieces I break off but to root them all would be to simply have too many. I don't baby these - no need to. I water mine once a week. Probably depends on your location. Mine are in a sunroom with windows all around and so can start to dry out pretty quick. You'll notice older leaves (like any plant) will start to get droopy and/or brown - just rip 'em off. This is one of my favorite plants because it really IS so easy to work with and, of course, the foliage itself is just so nice. Have fun!!!

Agree... whenever mine get too large I start new ones. I used to root cuttings in water, but now I just cut the cane and stick it down into moist potting mix... keep the potting mix moist and it seems to take a week or two before it starts rooting, perks up, and starts growing again. You'll almost always see new shoots develop off the old cane left behind, so I usually cut that back to soil level.

That's cool...never tried to just stick them right back in the pot without rooting beforehand. As I said, these things are extremely tough.

Thanks for all suggestion! i have heard of sticking the canes back in the pot without rooting in water but have not tried that method, (afraid it would die) I have always water propagated. Most likely I will end up separating the canes so I can manage the plant better just sticking them in soil.

Three4rd47. Thanks for all the information and insight into dumb canes, it was very helpful!

Glad to help...

Thanks everyone! Out of everything I’ve read on the Internet. You guys have the best answers and simple :-) so thank you