Whipple's Penstemon (Whippleanus)

The Whipple's Penstemon (Whippleanus) 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 Whipple's Penstemon (Whippleanus) has green foliage and inconspicuous purple flowers, with an abuncance of conspicuous brown fruits or seeds. The greatest bloom is usually observed in the late summer, with fruit and seed production starting in the fall and continuing until fall. Leaves are not retained year to year. The Whipple's Penstemon (Whippleanus) has a short life span relative to most other plant species and a rapid growth rate. At maturity, the typical Whipple's Penstemon (Whippleanus) will reach up to 3 feet high, with a maximum height at 20 years of 0 inches.

The Whipple's Penstemon (Whippleanus) is usually not commercially available except under contract. It can be propagated by container, seed. It has a moderate 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 -34°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Growth Rate Rapid
General Type Subshrub, Forb/herb
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Short
Plant Nativity Native to U.S.
Commercial Availability Contracting Only
Physical Characteristics
Bloom Period Late Summer
Displays Fall Colors No
Shape/Growth Form Multiple Stem
Drought Tolerance Medium
Shade Tolerance Intermediate
Height When Mature 3
Vegetative Spread None
Flower Color Purple
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Fall Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Container, Seed
Moisture Requirements Medium
Cold Stratification Required Yes
Minimum Temperature -34
Soil Depth for Roots 6
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Rapid
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 7–8 pH
Precipitation Range 13–13 inches/yr
Planting Density 1700–4800 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 6
Minimum Frost-Free Days 117 day(s)
Salinity Tolerance None
CaCO3 Tolerance High
Sustainability & Use
Leaf Retention No
Palatability High
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