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The Royal Penstemon (Speciosus) is generally described as a perennial forb/herb. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The Royal Penstemon (Speciosus) 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 mid summer, with fruit and seed production starting in the spring and continuing until summer. Leaves are not retained year to year. The Royal Penstemon (Speciosus) has a long life span relative to most other plant species and a moderate growth rate. At maturity, the typical Royal Penstemon (Speciosus) will reach up to 2.5 feet high, with a maximum height at 20 years of 0 inches.
The Royal Penstemon (Speciosus) is usually not commercially available except under contract. It can be propagated by 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 -33°F. has high tolerance to drought and restricted water conditions.
| Category | |
|---|---|
| Growth Rate | Moderate |
| General Type | Forb/herb |
| Growth Period | Spring, Summer |
| Growth Duration | Perennial |
| Lifespan | Long |
| Plant Nativity | Native to U.S. |
| Commercial Availability | Contracting Only |
| Bloom Period | Mid Summer |
|---|---|
| Displays Fall Colors | No |
| Shape/Growth Form | Multiple Stem |
| 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 |
| Propagations (Ways to Grow) | Seed |
|---|---|
| Moisture Requirements | Low |
| Cold Stratification Required | No |
| Minimum Temperature | -33 |
| Soil Depth for Roots | 14 |
| Toxic to Nearby Plants | No |
| Toxic to Livestock | No |
| After-Harvest Regrowth Rate | Slow |
| After-Harvest Resprout Ability | No |
| Responds to Coppicing | No |
| pH Range | 6.4–8 pH |
|---|---|
| Precipitation Range | 8–8 inches/yr |
| Planting Density | 0–0 indiv./acre |
| Soil Textures | Coarse, Medium |
| Soil Depth for Roots | 14 |
| Minimum Frost-Free Days | 110 day(s) |
| Salinity Tolerance | None |
| CaCO3 Tolerance | Medium |
| Leaf Retention | No |
|---|---|
| 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
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