I have several Plumerias in my small patio and would like to plant some of them together in the same pot to consolidate the area. They are now all in 1-gal pots. Will they like to be together and how large of a pot do I need to put 3-4 plants in the same pot of different variety and color? My plumerias are only 1-2 years old and haven’t bloomed yet.
Plumeria will actually grow in proportion to their pot.
I would suggest actually purchasing a couple of pots in the 3 to 4 gallon size.
Then when you remove the plants you can determine which pot will fit the root system with some grow for growth.
To large of a pot can lead to overwatering and root rot. Aim for a tighter fit.
Your Plumeria needs plenty of sunlight, pruning and fertilizer to encourage blooming.
I'm listing a few links that will help with blooming and care information.