Arizona Cypress

Best Growing Environment

The Arizona Cypress (Cupressus arizonica), a hardy and resilient evergreen tree, thrives in arid and semi-arid climates. It is well-suited for dry, well-draining soils, including sandy, rocky, or loamy types. This tree is native to the southwestern United States and northern Mexico, making it particularly adapted to hot, dry environments. It prefers full sun exposure, where it receives at least 6 to 8 hours of direct sunlight daily. The Arizona Cypress can tolerate drought conditions once established, making it an excellent choice for xeriscaping or low-maintenance landscapes. However, it does not thrive in poorly draining or waterlogged soils, which can lead to root rot.

Common Names

The Arizona Cypress is commonly known by various names, including:

• Arizona Smooth Cypress
• Smooth Bark Arizona Cypress
• Blue Cypress
• Cedar Cypress

Average Height and Diameter

The Arizona Cypress typically grows to an average height of 40 to 60 feet (12 to 18 meters), with a spread of 15 to 25 feet (4.5 to 7.5 meters) in diameter. It has a pyramidal to conical shape when young, gradually becoming more irregular with age. The dense, blue-green to silver-gray foliage provides a striking contrast in the landscape, making it an attractive option for windbreaks, privacy screens, or as a standalone specimen tree.

Growth Rate

The Arizona Cypress has a moderate growth rate, typically adding 12 to 24 inches (30 to 60 cm) in height per year under optimal conditions. This makes it a relatively fast-growing conifer, especially in comparison to other cypress species. The growth rate can be influenced by factors such as soil quality, water availability, and climate. Regular watering and proper care during the establishment phase can enhance its growth rate.

Sun Requirements

Arizona Cypress requires full sun to thrive, needing at least 6 to 8 hours of direct sunlight each day. While it can tolerate some light shade, especially in the hottest parts of the day, too much shade can lead to a sparser canopy and reduced vigor. Full sun exposure ensures dense foliage and promotes the tree’s natural, symmetrical shape.

Cold Hardiness

Arizona Cypress is hardy in USDA hardiness zones 7 to 9, where it can withstand winter temperatures as low as 0°F to 10°F (-18°C to -12°C). It is moderately cold-tolerant and can handle light frosts. However, in regions with harsh winters or extended periods of freezing temperatures, it may suffer damage or growth setbacks. In such climates, planting in a sheltered location or using windbreaks can help protect the tree from extreme cold and wind.

Water Requirements

Arizona Cypress is drought-tolerant once established, but young trees require regular watering to establish a deep and healthy root system. During the first year after planting, water the tree deeply once a week, allowing the soil to dry out between waterings. Once established, the tree requires less frequent watering and can survive on natural rainfall in most regions. However, during prolonged dry spells or extreme heat, occasional deep watering can help maintain the tree’s health and appearance.

Detailed Fertilizing Guide

Arizona Cypress generally requires minimal fertilization, especially if planted in well-draining, nutrient-rich soil. In the first year after planting, a balanced, slow-release fertilizer with an N-P-K ratio of 10-10-10 can be applied in early spring to support root development and overall growth. Fertilizer should be applied at the drip line, not directly at the base of the trunk, and should be watered in thoroughly after application. For mature trees, fertilization is typically unnecessary unless the tree shows signs of nutrient deficiency, such as yellowing foliage or stunted growth. In such cases, a light application of a balanced fertilizer in early spring can help.

Planting Guide

To plant Arizona Cypress, select a location with full sun and well-draining soil. If planting multiple trees, space them 15 to 25 feet apart to allow for their mature spread. Dig a hole twice as wide and as deep as the root ball. Place the tree in the hole, ensuring that the top of the root ball is level with or slightly above the surrounding soil. Backfill with soil, firming it gently around the base of the tree. Water the tree deeply after planting to help settle the soil and eliminate air pockets. Mulching around the base with organic material, such as bark or wood chips, can help retain moisture and regulate soil temperature, but be sure to keep the mulch a few inches away from the trunk to prevent rot.

USDA Zone

Arizona Cypress is best suited for USDA hardiness zones 7 to 9. It thrives in these regions, where the climate is warm and dry, with mild winters. In these zones, the tree can grow as a low-maintenance evergreen, providing year-round color and texture to the landscape.

By following these guidelines, you can ensure that your Arizona Cypress thrives, adding beauty and structure to your landscape with its distinctive form and resilient nature.