I recently was given several very large plumeria cuttings, each which have several branches and leaves.. The largest cuttimg was about 5 feet tall. Can I plant the cuttings as they are, directly in soil? Do I need to cut the branches and make smaller cuttings, remove the leaves? Also some of them have remnants of flowers on them(red stems and buds). Do I remove those?

brogaden

It would help to know your climate zone.
If in zone 10 (or 9b) you can plant these large cuttings straight in the ground. I would clip off (not tear off) all the leaves and yes, the inflorescence as well, however hard that is to do.
We're getting a little late in the year for rooting so you want to give it the best possible start. Don't water until you see new leaves emerge.

brogarden said:I recently was given several very large plumeria cuttings, each which have several branches and leaves.. The largest cutting was about 5 feet tall. Can I plant the cuttings as they are, directly in soil? Do I need to cut the branches and make smaller cuttings, remove the leaves? Also some of them have remnants of flowers on them(red stems and buds). Do I remove those?

I also forgot to ask if I need to let the the cuttings sit aside for some time. I've seen several videos of people saying not to plant new cuttings for several days up to several weeks.

A large cutting like that doesn't usually need to callous. Whatever you do - do not make a new cut and there is NO NEED TO WATER until there are roots.