Hi folks, it's the cajun old man here in Louisiana, trying my luck on plumeria's,😎 I bought 2 plumeria's online , I was told they were rooted, I got them today, they are 12" cutting with 3 tips on one , and 4 tips on the other, the one with 4 tips only has 1 root, all excited I planted them in a 2 gallon pot each, now Im wondering should I have dip the one with the lonely root in root starter? Or leave well enough alone?

I think you should leave it alone but treat it like a rooting cutting. And tell the seller that you're not pleased with one skimpy root!!