Subalpine Larch (Lyallii)

The Subalpine Larch (Lyallii) 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 late spring, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Subalpine Larch (Lyallii) has a long life span relative to most other plant species and a slow growth rate. At maturity, the typical Subalpine Larch (Lyallii) will reach up to 40 feet high, with a maximum height at 20 years of 15 feet.

The Subalpine Larch (Lyallii) 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 -58°F. has high 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 Late Spring
Displays Fall Colors Yes
Shape/Growth Form Single Stem
Drought Tolerance High
Shade Tolerance Intolerant
Height When Mature 40
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness No
Fruit/Seed Abundance Low
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Low
Cold Stratification Required No
Minimum Temperature -58
Soil Depth for Roots 36
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 3.9–5.6 pH
Precipitation Range 26–26 inches/yr
Planting Density 430–1200 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 36
Minimum Frost-Free Days 90 day(s)
Salinity Tolerance None
CaCO3 Tolerance None
Sustainability & Use
Leaf Retention No
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