How to Plant Arborvitae Trees
Plant Guide

The best time to plant an arborvitae tree is late winter or early spring when they are not actively growing. Planting your evergreen tree or shrub in the spring gives it plenty of time for its roots to establish before the first frost. However, it will have to endure the hot summer during its first year of growth so careful water monitoring is crucial.

Planting Arborvitae in Fall

Although spring is the ideal planting season, you can successfully plant arborvitae in the fall, especially in southern climates. Newly planted trees should be watered regularly until the ground freezes to help root growth enabling it to survive winter's frost.

Arborvitae evergreen trees or shrubs should not be moved after planting so it is important to take careful consideration when choosing a permanent location. The most important factors when deciding on plant placement are light requirements and estimated mature size.

Planting it on the property line is not advised, as a neighbor would be entitled to cut the tree back unevenly if it encroaches on their yard. You will also want to steer clear of planting under power lines and under shade trees that could cause damage or hinder growth.

Arborvitae trees are prized for their symmetrical and upright growth habit and you will invest years and years watching them grow to become an impressive and practical landscape staple. Damage and/or asymmetrical pruning is something you want to avoid at all costs!

Take careful note of the type of arborvitae you plant because their mature height and size can vary dramatically. Thuja Green Giant Trees can grow up to 60 feet tall at maturity, whereas Emerald Green Arborvitae grow no more than 15 feet typically.

What Kind of Soil Does Arborvitae Like?

Thuja are adaptable plants but prefer moist, well draining soil. They can tolerate a wide variety of soils, even including clay, but do not do well if the site is very dry. Once established, they can tolerate drought conditions but planting in soil that is constantly wet and saturated could cause root rot.

How Much Sunlight Does Arborvitae Need?

Arborvitae thrives with at least six hours of direct sunlight. They prefer full sun but can tolerate partial shade as long as they receive at least four hours of midday sun each day.

How Much Water Does Arborvitae Need?

Before planting, water your Arborvitae trees thoroughly while they are still in their nursery pots or burlap bags. The importance of watering between the time you first unbox and plant the tree is often underestimated and is crucial to the plant’s health. The day before you plant, give your tree and the hole you have prepared a good soaking. After planting, water the site two times a week for the first 60 days of establishment.

Careful water monitoring is especially important when rainfall is scarce and during the dry fall months leading to first frost. Arborvitae do not ever go dormant, so their roots must receive enough moisture preceding winter in order to survive.

Garden Tip: Use a soaker hose to make sure evergreens are receiving enough water, especially during dry spells or if drought conditions are present.

Is Mulching Necessary?

Mulching is not necessary, but it is highly recommended. It helps discourage weed growth while encouraging healthy and moist soil. After planting, topdress the soil with 1 to 2 inches of shredded hardwood mulch or pine fines, leaving 6 inches from the base of the tree to prevent rotting of the stem.

Fertilizing Your Arborvitae

After planting, we recommend applying a slow-release fertilizer, such as Espoma Holly-Tone. Slow-release fertilizer also provides additional acid to the soil, which allows Arborvitae to thrive. If your soil is already acidic enough, adding nutrient-rich organic matter or compost will help support new growth and keep the plant healthy.

Staking Your Arborvitae

Staking is typically not necessary. However, it will help prevent your Arborvitae from leaning, being uprooted, or blown over during the establishment period. Affix two or three equally spaced stakes to ensure stabilization for the first year. After the first year, remove the stakes so they can grow and adapt without assistance.