Why haven't all the jacarandas bloomed yet? When will purple reign again in L.A.?

Key Facts

Most of the time, jacaranda trees flower between late April and mid-June, and this year it’s looking like more will be blasting “Purple Rain” like a lowrider with a trunk full of subwoofers in the coming weeks.
Subscribe to Continue Reading Even in late May, jacaranda trees in Santa Monica, left, and Highland Park had yet to reach their full purple glory.
Sack cautions further that the entire flowering sequence in jacarandas and similar trees is “not completely understood.”
One especially intriguing piece of the puzzle is how trees store and use information about previous seasons when flowering, in addition to current temperatures.