Spiraea nipponica ‘Halward’s Silver’ Plant Data Family Name: Rosaceae Common Name: Halward's Silver spirea Other Name(s): Spiraea nipponica Other Name(s): 'Halward's Silver' Hardiness Zones: Zone 4: (-34 to -29 C) Plant Code: spnh Flowering Time: May, Jun, Flowering Color: White, Leaf Form: Simple, Leaf Shape: Ovate, PlantSomething BC Garden Centre Listings No members have selected this plant.