The plant responsible for the new color is the Palo Santo, which is Spanish for 'holy stick.' It's so called as it is in the incense family, and its wood is burned in churches on the South American continent. It is a tree that remains dormant with no leaves for most of the year, which it does to avoid transpiring during the dry season.
The first major rains trigger the quick production of leaves and flowers, with the fruits following soon after. Within a couple of weeks, the islands will be unrecognizable from the month before.