The Blue Ice Cypress (Cupressus arizonica var. glabra ‘Blue Ice’) is an evergreen conifer recognized for its distinctive silvery-blue foliage and naturally conical form. This tree offers year-round visual interest and a striking contrast against other greenery in a landscape, contributing to its appeal as an ornamental tree.
Understanding Blue Ice Cypress Growth
The Blue Ice Cypress grows at a moderate to fast rate, typically adding 1 to 2 feet of height per year. Established trees may grow 2.5 to 3 feet annually. This allows the tree to reach a mature height of 20 to 30 feet within a decade, with some specimens reaching 40-50 feet over time. Its fast growth makes it a desirable landscape choice.
Factors Influencing Growth
Growth is influenced by several factors. Full sun (at least 6-8 hours daily) is ideal for robust growth and vibrant foliage. Partial shade may result in reduced growth and less vivid color. The tree thrives in well-drained soil, tolerating clay, loam, sand, and silt, with a preferred pH of 6.5-8.0.
Young trees need consistent moisture, but established cypress are drought-tolerant. They are hardy in USDA Zones 7-9, with some tolerance down to Zone 5 or 6 if protected from extreme cold. The tree is also heat tolerant, making it a good selection for warmer climates.
Caring for Optimal Growth
Optimal growth requires specific care. Plant in full sun with well-drained soil to support healthy root development. During the first year, deep water once or twice weekly for root establishment. After 2-3 years, established trees need less frequent watering due to increased drought tolerance.
Fertilize younger trees in early spring with a balanced slow-release formula (e.g., 10-10-10 or 12-6-8) around the drip line. This can support vigorous development. Avoid over-fertilizing, especially with nitrogen, as it can weaken the tree. Apply a 2-3 inch mulch layer around the base, keeping it a few inches from the trunk, to retain moisture and regulate temperature.
Pruning for Health and Shape
Pruning maintains the Blue Ice Cypress’s health and shape, not its growth rate. The tree naturally forms a conical, upright shape, often needing minimal pruning. Prune in late winter or early spring before new growth.
Remove any dead, damaged, or diseased branches to promote overall tree health and prevent potential issues. Lightly shaping the tree helps maintain its desired aesthetic appeal, especially when used in hedges or as a specimen. Avoid heavy pruning, which can stress the plant. Regular, light pruning also improves air circulation within the canopy, reducing disease risk.
Landscape Considerations
The Blue Ice Cypress’s growth rate and mature size are key for landscape design. Its fast growth and height (20-30+ feet) make it suitable for privacy screens, windbreaks, or as a striking specimen tree. Its dense, upright habit creates effective visual and wind barriers in a relatively short timeframe.
Allow adequate space for its mature spread, which can range from 10 to 15 feet wide. For privacy screens, space trees 8-10 feet apart to prevent overcrowding. Considering its ultimate size ensures proper integration into the landscape as it matures.