I have had this plumeria since 2021. It has a brown area on the bottom. Is it root rot? Should I take it out and cut it to reroot it or wait?

Looks like there might be issues but you can always remove it from the pot and check the roots before you start cutting it up.

Tagging @drdawg @teamcll for additional input.

@gstenbakken, welcome to NGA.

I agree with Gigi, simply break up the soil in this pot, revealing more of that stem. I would suggest that this plant is in need of up-potting regardless. Of course, if the stem is soft and you aren't see what looks like viable roots, you should start cutting the stem back, beginning an inch or so above the suspicious colored stem and continue to cut an inch or two more until you get clean, white tissue that bleeds white "latex". That stem will then have to be rooted.

Thank you very much! So when I repot it should go in a bigger one? I have not really seen healthy roots in plumeria. I will google to see what they look like.

Yes, @gstenbakken. Keep in mind that plumeria are trees, not houseplants. You can't overpot these plants. The main thing you are looking for first, is the condition of that main stem (trunk). If it is soft and discolored (compare the look and feel with the upper stem), it doesn't matter what the roots are like. It's going to need cutting, then callusing, and then rooting.

Looks fine to me