Degroot's Spire Cedar Thuja occidentalis 'Degroot's Spire' Description Dark green twisted soft foliage. Growth Habit: Narrow, compacted, columnar to pyramidal Mature Height: 20' to 25' (6m to 7.5m)Mature Spread: 2.5' to 4' (76 cm to 122 cm)Growth Rate: Slow More Details Sun Exposure: Full Sun to Partial ShadeCold Hardiness Zone: 3Landscape Uses: Hedge or garden accent