Mountain Hemlock Live Tree – Tsuga mertensiana

Bring the beauty of the Pacific Northwest mountains to your garden with a Mountain Hemlock. This graceful evergreen conifer features attractive blue-green foliage and a naturally elegant pyramidal shape. Its flexible trunk and branches also make it an interesting choice for bonsai enthusiasts.

Mountain Hemlock is a slow-growing tree that thrives in cool climates with moist, well-drained soil. It can be grown as a landscape specimen or in a carefully maintained container.

Plant Features

• Botanical Name: Tsuga mertensiana

• Common Name: Mountain Hemlock

• Plant Type: Evergreen conifer

• USDA Hardiness Zones: 4–8

• Growth Rate: Slow-growing

• Mature Landscape Size: Approximately 15–30 feet tall and 8–15 feet wide in garden settings; potentially much larger in its native habitat

• Foliage: Attractive blue-green evergreen needles

• Uses: Landscape specimen, cool-climate garden, and bonsai

Growing Conditions

• Light: Full sun to part shade. In warmer regions, provide shade and only a few hours of morning sun.

• Soil: Moist, very well-drained loam, sandy, or rocky soil.

• Preferred Soil pH: 5.0–6.0

• Water: Maintain consistent moisture, especially while the roots establish. Water deeply and allow the upper soil layer to dry slightly between waterings.

• Climate: Prefers cool, moist summers and long, cold winters.

Mountain Hemlock is drought-tolerant once established, but it does best with regular moisture and excellent drainage. Avoid heavy clay, prolonged waterlogging, extreme heat, and polluted environments. It may struggle in hot, humid regions, including much of the southeastern and eastern United States.

Landscape and Bonsai Potential

Native to mountainous regions of western North America, Mountain Hemlock is naturally adapted to challenging high-elevation conditions. Its flexible trunk and branches help it withstand heavy snow loads and give it appealing potential for bonsai styling.

In the landscape, its blue-green foliage and pyramidal shape provide year-round evergreen interest. Allow plenty of room for its eventual spread when planting outdoors.

Care and Maintenance

• Apply a light, balanced slow-release fertilizer in early spring if needed.

• Pruning is generally minimal.

• If pruning is necessary, do so in late winter or early spring.

• Avoid cutting into old wood. Mountain Hemlock does not reliably produce new growth from old, bare branches.

• For container growing, use a very well-draining conifer soil mix. Our Dryland Conifer Potting Soil Mix is recommended.

Native Range

Mountain Hemlock is native to the Pacific coastal region from southeastern Alaska through British Columbia, Washington, Oregon, and Northern California, with additional inland populations in Idaho and Montana. It naturally grows at higher elevations through much of its southern range.

Shipping Information

• Expected Shipping Availability: Early December 2026

• Orders may be held if temperatures are above 89°F or below 20°F to help protect plants during transit.

• Every plant is inspected before shipment.

• If your plant arrives damaged, please contact us promptly with photos of the package and plant so we can help resolve the issue.

Please Note: Live plants are natural products. Individual plants may vary in shape, branching, and appearance. Allow time for your tree to acclimate after delivery.