I need advice about a Dipladenia that I bought today. I actually thought that it was a type of Mandevilla, until I got it home and Googled the name. It is in the same family, and needs the same type of care. But, I can't find specific info online about my main concern.
It has roots sprouting out of the stems at the lower knobs. Some of them are more than two inches above the soil. It is obviously root bound, but seems healthy. (I did pluck off some yellow leaves before taking pics.) I am wondering whether I am supposed to bury these upper roots. I don't know if they are "air roots" like my orchids have, or it they are runner roots that are seeking soil. I don't know whether to plant this deeper than it is now to accommodate some of these these roots, or whether to just let them breathe. Or maybe I should just plant it in a wider pot with the soil slightly higher that it is now, and just try to make cuttings from those rooty stems? I did have a happy Mandevilla years ago, and it did not have these rooty stems. But, it was also in a huge pot. (And, it was not Dipladenia, either. lol)
I am wondering if the red plastic pot in the pics would work for now, or if I need to try something wider. I don't usually buy plants without a plan. But, for $4.99, I just couldn't resist this beauty. I live in Norfolk, Virginia, USA, and will have to overwinter it indoors. The soup can is only in the one pic because it happened to be handy to use for size reference.
Update: I transplanted it as suggested. I added a pic of the rootbound roots after I cut the pot off, and a pic of it in the new pot. The other pot cracked when I tried drilling holes in the bottom, but this one should be big enough, for now.