Ti is a very forgiving plant; I've had fine results rooting cuttings in plain tap water - in the shade on my back porch. Once there were enough roots, I potted them up in regular potting mix & transplanted outdoors when there was new growth. I've even grown plants from a cutting that was part of a florist's bouquet. Roots form along the stem, so the longer the better, IME.

Hi The last I've heard is that Ti plant is a Cordyline not a Dracaena so you can google either genus and get lots of descriptions. Also the last I heard they originated from eastern Asia and were brought to Hawaii by the polynesians. Not only are there many wild species but dozens if not hundreds of hybrids so positive ID of a plant is almost impossible. you can certainly check out the many nurseries that sell these and compare pix with what you have. As I recall Rare flora here in Florida has at least 25 pix of hybrids that they sell. Obviously positive I D is almost impossible Good luck!! gary

You may keep them unless they are spotted from mites or leaf spot diseases. If your Cordyline is growing at an indistinguishable rate it will take longer for the plant to suck all the nutrients out of the browned leaves before dropping them naturally. Probably by now ( 9 months after your post) you can trim them off if they are the lower older leaves. Just know if you change anything about their culture they might bounce back to a deep maroon/brown green if they are lower leaves. A shocked cordyline will neglect to nurish 2/3 of lower leaves turning them an unattractive color but possibly without dropping them. If they are papery like papyrus then they are long dead and removing them is fine. Heck removing lower cordy leaves is always fine I'd just add a bit of nutrient solution to the next water bath and give them brighter shade for a few days. Remember low humidity will brown leaf edges working its way into the center. None of this applies if they are new leaves. I hope to see an update on how the color is now. I'm suspicious that the first post is actually 'kiwi' or 'pete's rainbow". Let me know if I didn't make sense or miscommunicated. My miss Andrea needs a humidifier and to be cool but my red sister doesn't and likes warmth. Hope that helps. I'm z7a in Nashville and all my Cordylines are indoor specimens that enjoy co-potting with tropical epiphytic vines for humidity and awkward small talk.

I had been having a similar concern about some Ti plants red sister i think, that I had over wintered and this spring /summer rooted tops and logs and even the mother plants when they started growing back did not have their former color. Fast forward and as fall started to approach the color gradually changed and returned to normal with the new growth being brilliant pink. I think it has something to do with maturity and “ day length” but I really don’t know why. I have googled Ti plant and day length but it generated no useful information.