Birchleaf Spirea Spiraea betulifolia 'Tor' Description Blooms white flowers. Green foliage.Bloom Period: SpringGrowth Habit: Compact and roundedMature Height: 2' to 3' (60 cm to 90 cm)Mature Spread: 2' to 3' (60 cm to 90 cm)Growth Rate: Moderate More Details Sun Exposure: Full sun to partial shadeCold Hardiness Zone: 4Attracts ButterfliesDeer ResistantLandscape Uses: Hedge, border/edging or foundation planting