Mountain Hemlock (Mertensiana)

The Mountain Hemlock (Mertensiana) is generally described as a perennial tree. This is native to the U.S. (United States) has its most active growth period in the summer . The greatest bloom is usually observed in the early summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are retained year to year. The Mountain Hemlock (Mertensiana) has a long life span relative to most other plant species and a slow growth rate. At maturity, the typical Mountain Hemlock (Mertensiana) will reach up to 125 feet high, with a maximum height at 20 years of 30 feet.

The Mountain Hemlock (Mertensiana) is usually not commercially available except under contract. It can be propagated by bare root, container, seed. It has a slow ability to spread through seed production and the seedlings have low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -18°F. has low tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Slow
General Type Tree
Growth Period Summer
Growth Duration Perennial
Lifespan Long
Plant Nativity Native to U.S.
Commercial Availability Contracting Only
Physical Characteristics
Bloom Period Early Summer
Displays Fall Colors No
Shape/Growth Form Single Stem
Drought Tolerance Low
Shade Tolerance Tolerant
Height When Mature 125
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness No
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements High
Cold Stratification Required Yes
Minimum Temperature -18
Soil Depth for Roots 40
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 4.5–7.3 pH
Precipitation Range 42–42 inches/yr
Planting Density 300–1200 indiv./acre
Soil Textures Coarse
Soil Depth for Roots 40
Minimum Frost-Free Days 160 day(s)
Salinity Tolerance None
CaCO3 Tolerance Low
Sustainability & Use
Leaf Retention Yes
Palatability Medium
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA