Growing an Arizona Cypress Tree as a Houseplant

The Arizona cypress (Cupressus arizonica) is an attractive evergreen conifer that thrives in hot, dry climates. Native to the southwestern United States and Mexico, this versatile tree also makes an excellent houseplant for areas with colder winters.

While they reach towering heights of 40-50 feet in the wild Arizona cypress trees can be kept small enough to grow indoors for many years. Their compact growth habit and tolerance of dry air make them ideal as houseplants.

Here is a detailed guide on how to successfully grow an Arizona cypress tree indoors:

Selecting a Container

Arizona cypress trees have fast-growing roots that dislike being rootbound. Select the largest container possible, at minimum a 12-16 inch diameter pot or wooden planter box. This will allow several years of growth before repotting becomes necessary.

Be sure the container has drainage holes to prevent soggy soil Planting in a self-watering container with a water reservoir is an excellent option for maintaining optimal soil moisture.

Choosing a Potting Mix

Arizona cypress trees require a loose, porous potting mix that drains well. A quality commercial cactus/succulent soil or a homemade mix of:

• 1 part peat moss or coco coir
• 1 part perlite or pumice
• 1 part compost or worm castings

Will provide the fast drainage these trees need while still retaining some moisture.

Planting the Arizona Cypress

Carefully remove the tree from its nursery pot without damaging the root ball. Loosen any circling roots before placing in the new container.

Plant at the same level as it was growing in the nursery pot. Backfill around the root ball with fresh potting mix, gently tamping down to remove air pockets.

Allow several inches of space between the soil level and the rim of the pot. This provides room for watering.

Watering Needs

Arizona cypress trees are quite drought tolerant once established, but young trees need regular watering:

• During the first year, keep the soil consistently moist but not soggy.

• After establishment, allow the top inch of soil to dry out between waterings.

• When watering, thoroughly drench the entire root zone until water drains from the bottom of the container.

• Drooping foliage is a sign the tree needs more frequent watering.

• Use room temperature water, as cold water can shock the roots.

Sunlight Requirements

In their native habitat, Arizona cypress trees receive intense sunlight throughout the day. When growing indoors, they need as much sun as possible:

• Place in a south facing window or the brightest location available.

• Rotate the tree periodically so all sides receive equal sunlight.

• Supplement natural light with 12-14 hours per day of artificial grow lights. LED full spectrum grow lights work best.

• Insufficient light will cause leggy, sparse growth.

Fertilizer

During the active growing period from spring to early fall, feed container grown Arizona cypress trees with a balanced liquid fertilizer diluted to half strength. Any indoor plant fertilizer will work well.

Apply fertilizer monthly, discontinuing during winter dormancy. Rinse any accumulated mineral deposits from the foliage.

Ambient Environment

Arizona cypress trees thrive in the same ambient conditions that are comfortable for humans:

• Daytime temperatures between 65-75°F

• Nighttime temperatures around 55-65°F

• Average indoor humidity around 40-60%

Avoid drafty locations as sudden temperature fluctuations can damage tender new growth. Keep the tree away from heating/cooling vents.

Repotting

Young Arizona cypress trees will need repotting every 2-3 years in progressively larger containers to accommodate their expanding root systems.

Carefully remove the rootball and loosen any matted roots before placing back in the same container with fresh potting mix added around the edges. Or move the tree to a 2 inch larger diameter pot.

Repot in early spring right before active growth resumes. Prune back any wayward branches at the same time to maintain the desired compact shape. Discard any depleted old potting mix and sterilize containers to prevent disease transmission.

Pruning

Light pruning is needed to keep an Arizona cypress compact enough for indoor growth. In early spring, remove:

• Any branches extending too far outside the foliage perimeter

• Inner branches that clutter interior spaces

• Dead, damaged, or yellowing growth

Never remove more than 15-20% of the live foliage when pruning. Outdoor trees rarely require pruning once established, but indoor specimens need occasional corrective pruning.

Troubleshooting Common Issues

Growing Arizona cypress indoors comes with some potential challenges:

• Dropping leaves – Usually indicates insufficient watering or humidity. Slow down watering frequency and use a humidifier.

• Sparse foliage – Not enough sunlight. Rotate tree for even exposure or use supplemental lighting.

• Leggy growth – Needs more sunlight. Can prune back stray branches.

• Root rot – Soil staying too wet. Repot with fresh mix and improve drainage. Discard any rotten roots.

• Pests – Spider mites, aphids, and scale insects will attack stressed trees. Use insecticidal soap sprays to control outbreaks.

By providing the preferred conditions outlined above and avoiding common mistakes, Arizona Cypress trees make fabulous and unique houseplants. Their evergreen nature gives year-round enjoyment indoors.

Transitioning to the Outdoor Garden

If you later wish to permanently move your container grown Arizona cypress tree outdoors, some preparations are needed:

• Select a planting spot with full sun exposure and well-draining soil. Dig a hole to the same depth as the root ball.

• During the first year outdoors, provide supplemental watering during dry periods until the roots establish.

• Introduce the tree to the outdoors gradually by placing outside for short periods over the course of a few weeks to harden it off.

• Transplant the tree outdoors in early spring after the last frost but before active growth resumes.

• Protect from harsh sun and wind exposure using a shade structure the first few weeks.

With attentive care during the transition, a beloved houseplant Arizona cypress can thrive for many years planted in the landscape. Just be sure to choose a variety suited to yourclimate zoneand suitable planting location.

An Unique and Versatile Houseplant

With their pyramidal shape and soft evergreen foliage, Arizona cypress trees make eye-catching additions to home decor. Their ability to handle dry indoor air and low light conditions means that providing a suitable environment is not difficult. Just be sure to give them plenty of space in a roomy container and bright light.

One of the few conifers that can successfully be grown as a houseplant, the Arizona cypress displays the striking character of a full-size tree in miniature. Bonsai enthusiasts also value these trees for their potential for shaping. With the proper care outlined above your indoor Arizona cypress can remain healthy, attractive, and relatively compact for many years of enjoyment.