Think of Puffer Fish panicle hydrangea (H. paniculata) as a larger, more puffed up Bobo, with fluffy white blooms that engulf the entire plant, nearly obscuring the foliage. The flowers open and mature to a pure white. As the blooms age, they turn lime green and, for a bit of surprise, a fresh sprig of white flowers emerges from the tip of the panicle. A tight, compact habit with stems strong enough to hold its blooms.