I know a place where buoy berries bloom during our cold winter and in our turbulent spring. There are two species: Buoy lobstertrapicus, which is the high bush version shown above that even blooms in trees, and Buoy mooringmarkeria, which is more of a clinging vine, as shown below:
Of course, their habitat is the WoodenBoat campus. (Images taken in Brooklin, Maine, on March 7 [tree] and 14 [“vine”], 2025.)