I wonder if it is more the length of the day that triggers dormancy than the cold? Here some of my plumeria are already showing some yellowing of leaves. Nights are perhaps a little bit cooler but the lows are still in the high to mid 70'sF and days are hot. We don't have a huge swing in day length, perhaps 2 hours difference from season to season. I'm just wondering what regulates their 'clock'?
