I am a new plumeria owner. I planted my cutting in April and kept it indoors with plenty of sunlight until it began to get warmer outside. Now I bring it out during the day and take it inside at night. I followed the instructions strictly and within 4 weeks of planting the cutting began to grow leaves. I have it in a 6 inch pot. It started to bud about two weeks ago, with bright, fragrant flower buds (white) and lush leaves. There are about 9 buds, however, the buds didn't fully open and now the petals are turning brown!! Some have browned before even opening and the ends of the partially open flowers are browning too.What happened?!?!