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The Hooker's Evening-primrose (Hookeri) 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 summer . The Hooker's Evening-primrose (Hookeri) has green foliage and inconspicuous yellow flowers, with an abuncance of conspicuous fruits or seeds. The greatest bloom is usually observed in the late summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Hooker's Evening-primrose (Hookeri) has a moderate life span relative to most other plant species and a rapid growth rate. At maturity, the typical Hooker's Evening-primrose (Hookeri) will reach up to 5 feet high, with a maximum height at 20 years of 5 feet.
The Hooker's Evening-primrose (Hookeri) is usually not commercially available except under contract. It can be propagated by seed. It has a moderate ability to spread through seed production and the seedlings have high vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -23°F. has medium tolerance to drought and restricted water conditions.
| Category | |
|---|---|
| Growth Rate | Rapid |
| General Type | Forb/herb |
| Growth Period | Summer |
| Growth Duration | Biennial, Perennial |
| Lifespan | Moderate |
| Plant Nativity | Native to U.S. |
| Commercial Availability | Contracting Only |
| Bloom Period | Late Summer |
|---|---|
| Displays Fall Colors | No |
| Shape/Growth Form | Single Stem |
| Drought Tolerance | Medium |
| Shade Tolerance | Intolerant |
| Height When Mature | 5 |
| Vegetative Spread | None |
| Flower Color | Yellow |
| Flower Conspicuousness | Yes |
| Fruit/Seed Abundance | High |
| Fruit/Seed Seasonality | Summer Fall |
| Seed Spread Rate | Moderate |
| Propagations (Ways to Grow) | Seed |
|---|---|
| Moisture Requirements | Low |
| Cold Stratification Required | No |
| Minimum Temperature | -23 |
| Soil Depth for Roots | 6 |
| Toxic to Nearby Plants | No |
| Toxic to Livestock | No |
| After-Harvest Regrowth Rate | None |
| After-Harvest Resprout Ability | No |
| Responds to Coppicing | No |
| pH Range | 7–8.5 pH |
|---|---|
| Precipitation Range | 10–10 inches/yr |
| Planting Density | 10000–25000 indiv./acre |
| Soil Textures | Coarse, Fine, Medium |
| Soil Depth for Roots | 6 |
| Minimum Frost-Free Days | 140 day(s) |
| Salinity Tolerance | Low |
| CaCO3 Tolerance | High |
| Leaf Retention | No |
|---|---|
| Palatability | Low |
| 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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