Spiraea thunbergii Plant Data Family Name: Rosaceae Common Name: Thunberg spirea, baby's breath spirea Other Name(s): Spiraea thunbergii Hardiness Zones: Zone 3: (-40 to -34 C) Plant Code: spth Flowering Time: Mar, Apr, May, Jun, Flowering Color: White, Leaf Form: Simple, Leaf Arrangement: Alternate, Leaf Shape: Lanceolate, PlantSomething BC Garden Centre Listings No members have selected this plant.