Hi there, I am one of those professional plant people, and I deal with dracaenas a lot. I had a long chat with the wholesale greenhouse lady where I buy my plants about dracaena marginatas recently. She told me that when they are grown in Florida, they grow them under very high light with lots of fertilizer, so that they grow fast. Time is money, the faster they get the plant to full size, the sooner they can sell it and use the space to grow another one. With all of this light and water, their leaves are very firm, to the point that they can give you an extremely painful poke in the eye, like being poked with a stick (don't ask me how I know this...) A plant will keep these stiff leaves for several months after being put into its office location. If the light is very bright, the leaves will stay stiff. If the light is dim, they will gradually start to droop over time. Once they droop, I don't think they can get stiff again, at least not those particular leaves. The droopy plants that you see the plant company caring for probably only need water every two to four weeks, especially if it is dark and/or cold. I do not recommend moving marginatas into cold. They do not like cold at all, and it will lead to the lower leaves turning a mushy yellow, along with all sort of possibilities for root and stem rot. Marginatas do like to be kept dry, especially if they are in a dim location. Not as dry as a cactus, but pretty darn dry. When in doubt, err on the side of not watering. The ones you see the plant company take care of with the stiff leaves? It is quite possible that they remove them and replace them with new ones periodically, and that is why the leaves appear to stay stiff. Hope that helped!

Thank you kindly. I feel like I made a friend for life. I have many questions, but I dont want to be bothersome...I'm going to trim the brown leaves off and put into soil. Do I need to rub and rooting powder on it? Also should I use a fertilizer as soon as I pot it. I make coconut oil from scratch and I save the shells to grind up as composts. Would it be good to mix with the soil and perlite for my lemon lime cutting? Thanks in advance!!!

Remove the dead and dying leaves. Overall it looks fine unless you can post photos of the new leaves showing a major problem. Was the residue there when you bought it? I see a lot of plants from Florida (Home Depot and the like) where the plants were treated before shipping. Usually a wet sponge/paper towel can remove most of the residue. Leaving it in a shower without enough light is not good for it. It was enough shock for it being shipped hundreds of miles to live in a home when it was nice and happy growing in a commercial greenhouse.

They were both called Janet Craig, that's my challenge 😅 Although the longer leafed one popped up as that in a Google image search, so it may really be something else