I've grown 'Celadine' aka "Graveyard Plumeria" since 1998 outdoors..most years potted,some in ground. Its done much better potted. Soil gets much warmer. BUT, I ordered in March a Plumeria obtusa,and it came with P.rubra 'Royal Hawaiian' cutting. Both bare stems. Right now,the P.obtusa has leafed out a little faster,and decided to grow three branches from the get go. Who thinks they know what the hardiest varietys are? How fussy is P.obtusa? It makes ( in photos) a great looking sculptural plant. Is it a good bloomer in less then hot areas? Any blooms at all?lol. Maybe that's the real question.