Hi Janine Martin's and Carol I am also from Jhb, I import plumeria/frangipani seed and grow them. Frangipanis are relatively full up here, many have them on their pavements but it is the normal white, yellow, light pink or a darker pink. As our climate in summer is very hot rooting a cutting I a pot would mean that every now and again you would have to spray the soil to keep it just slightly moist of the cutting g may dry out completely and die. Keeping them to moist causes rot and you will lose the cutting. In milder climates the soil won't dry out as quickly as I South Africa but here I find missing the pot every 3 days or so in summer keeps just enough moisture in the pot to prevent drying out. I also use a an instrument to measure moisture content in my pots especially amorphophallus as they need water but not too much. Regards Vici

Does it happen at any particular time of year, or is it happening all the time? And what type of soil is in the planters? Don't know what you mean by "... noticed one tip to actually have sap as well ...". All parts of the plant should have sap.

Type is plumeria rubra. As to what cultivar, it may be hard to tell when the ID tag is lost, best way is to ask the seller/source. Otherwise, the petals look normal to me, you may want to observe if they keep this shape on next year's blooms. For future reference, you may want to post plumeria related questions in the plumeria forum at https://www.houzz.com/discussions/plumeria-forum-dsbr0-bd~t_29994 where the experts can chime in.

3 weeks is not a very long time.. in tree/shrub time .... i think you need patience ... it does look like cold damage on some level ... but i am not understanding if there was a recent cold period/event ... i look to the new growth .... its there ... in the second pic ... but i dont know what to make of it.. since i dont know this plant .... i would probably give it a few more weeks and see how that new growth continues ... if there was some event.. back in time ... and the event is over ... then we should really not be trying to 'fix' that problem ... but we cant really tell if that is/was the only event ... i am always hesitant to continue reacting ... when there really isnt any current problem to fix ... i sometimes call it.. trying to love a plant to death ... i would defer to anyone with more experience.. but in the mean time ... just keep it properly watered .... and give it more time ... ken