A fairly new cultivar, Hydrangea pan. 'Polar Bear' features large conical panicles of flowers in mid to late September, which initially emerge lime green, turn pure white in late summer, before then fading to pink in autumn, on a sturdy and robust deciduous shrub, which can grow to 2m x 2m if left unpruned. However, pruning back to good buds 30 to 40cm from the ground each spring will keep the shrub to c 120cm high and wide, and produce larger flowerheads. Grow in full or partial sun on any well drained but fertile soil. Hydrangea paniculata 'Polar Bear' is completely hardy in the UK.