Mountain Blue Penstemon (Laetus)

The Mountain Blue Penstemon (Laetus) is generally described as a perennial subshrub or forb/herb. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The Mountain Blue Penstemon (Laetus) has gray-green foliage and inconspicuous blue flowers, with an abuncance of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the late spring, with fruit and seed production starting in the spring and continuing until summer. Leaves are not retained year to year. The Mountain Blue Penstemon (Laetus) has a long life span relative to most other plant species and a moderate growth rate. At maturity, the typical Mountain Blue Penstemon (Laetus) will reach up to 2.5 feet high, with a maximum height at 20 years of 2 feet.

The Mountain Blue Penstemon (Laetus) 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 medium vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 12°F. has high tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Moderate
General Type Subshrub, Forb/herb
Growth Period Spring, 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 No
Shape/Growth Form Single Crown
Drought Tolerance High
Shade Tolerance Intolerant
Height When Mature 2.5
Vegetative Spread None
Flower Color Blue
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Spring Summer
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 12
Soil Depth for Roots 12
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing No
Growth Requirements
pH Range 6–7.6 pH
Precipitation Range 12–12 inches/yr
Planting Density 1700–2700 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 12
Minimum Frost-Free Days 150 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Fire Resistant No
Causes Livestock Bloating None

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