Planting Emerald Cedars In Toronto

Emerald Cedars (Thuja occidentalis ‘Smaragd’) are a popular evergreen choice for Toronto homeowners looking to add year-round structure and screening to their landscapes. Native to eastern North America, this species thrives in the city’s climate, with its glossy, dark green foliage and conical shape providing a beautiful contrast to the changing seasons.

Choosing the Right Size and Spacing for Emerald Cedars

When selecting Emerald Cedars, consider the mature size of the tree and leave enough space for proper growth. As a rule of thumb, plant trees at a distance of at least 3 to 5 feet (90 to 150 cm) apart, depending on the desired density of the screen. For a loose, informal hedge, 3 to 4 feet (90 to 120 cm) is a good starting point, while 5 to 6 feet (150 to 180 cm) apart is ideal for a more formal, dense screen.

Planting Timing and Care

In Toronto’s climate, the best time to plant Emerald Cedars is in the spring or fall, when the weather is cooler and rainfall is more consistent. Avoid planting in the heat of summer, as this can stress the tree and lead to disease or pest issues. When planting, dig a hole that is twice as wide and just as deep as the root ball of the tree. Gently remove the tree from its container and place it in the hole, making sure the root flare (where the trunk flares out at the base of the tree) is level with the soil surface. Backfill with a mix of soil and organic matter, and water thoroughly.

Mulching and Watering for a Healthy Emerald Cedar

Mulching around the base of the tree helps retain moisture, suppress weeds, and regulate soil temperature. Use a 2- to 3-inch (5 to 7.5 cm) layer of organic mulch, such as wood chips or bark, keeping it a few inches away from the trunk. Water your Emerald Cedar regularly, especially during its first year after planting. Aim to provide about 1 inch (2.5 cm) of water per week, either through rainfall or irrigation. Avoid overwatering, which can lead to root rot and other problems.

Fertilizing and Pruning Your Emerald Cedar

Fertilize your Emerald Cedar annually with a balanced, slow-release fertilizer in the early growing season (late March to early May). Prune your tree in late winter or early spring to maintain its shape and promote healthy growth. Remove any dead or damaged branches, and trim back new growth to encourage a full, dense shape.