What Is the Soil PH for Thuja 'Green Giant'?

Soil pH

• Thuja "Green Giant" is tolerant of wide variety of soil types ranging from sandy loam to heavy clay. Generally, conifers like "Green Giant" grow best in an acidic soil, which have a pH lower than 7.0, as recommended by the Alabama Cooperative Extension. Make sure the soil is well-drained as the tree is intolerant of poorly drained or wet soils. According to the Virginia Cooperative Extension, planting in poorly drained soil is the leading cause of death of a conifer. Plant in a raised bed in wet ground.

Site

• The tree adapts well to areas of sun or light shade, but growth is optimal in full sun. Avoid planting in an exposed or windy area as this makes the tree highly prone to winter damage and drying. The University of Wisconsin Extension recommends planting evergreens on the northern or eastern sides of a house. Thuja "Green Giant" is hardy in U.S. Department of Agriculture hardiness zones 5 to 7.

Planting Suggestions

• The best time to plant evergreens like the "Green Giant" is during early fall when the tree is in its dormant state. The tree has a reduced water need at this time that corresponds naturally with the reduced ability of the newly transplanted roots to supply this water. The trees will have enough time to get established before active growth starts in spring. Irrigate new trees regularly throughout the first year, especially during dry weather conditions. Apply organic mulch around tree to help conserve soil moisture.

Size

• Provided optimal soil pH, water and other growth requirements, the "Green Giant" grows to a mature height of up to 60 feet with a 12- to 20-foot spread. The tree has a very symmetrical, pyramidal to conical form with dense, scale-like, dark green foliage. The ½-inch-long, green cones turn brown on maturity. The "Green Giant" is often used as an alternative for the Leyland cypress in landscapes.