I have a large plumeria in a pot, it is about three yrs. old, last year it started growing another plant down at the bottom of the
trunk, can I take it off and plant it? It is about 3 or 4 ins. tall and has 8 leaves on it
That is probably a sucker off of the root crown and has no roots of it's own. aIf it was a seedling, you could just dig up and re-plant with relative certainty of a successful transplant. But with a sucker, you will have to cut it and treat it as a cutting to be rooted. There is maybe a 50/50 chance at best that it will take.