Penstemon (davidsonii)
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Lee Riley Horticulturist USDA FS - Dorena Genetic Resource Center 34963 Shoreview Road Cottage Grove, Oregon 97424 541-915-7324 541-767-5709 (fax) lee.riley@usda.gov |
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| Family Scientific Name: | Scrophulariaceae | ||
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| Family Common Name: | Figwort | ||
| Scientific Name: | Penstemon davidsonii | ||
| Common Name: | Davidson's penstemon | ||
| Species Code: | PEDA2 | ||
| Ecotype: | Deschutes National Forest, Oregon | ||
| General Distribution: |
USA: CA , NV , OR , WA Canada: BC Native Distribution: Southern British Columbia to Tulare County, California and into Nevada Native Habitat: Rocky, alpine and sub-alpine woods and fields |
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| Propagation Goal: | Plants | ||
| Propagation Method: | Seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | 164 ml (10 in3) container | ||
| Time To Grow: | 17 weeks | ||
| Target Specifications: | Stock Type: Container seedling Root System: Firm plug in container. | ||
| Pre-Planting Treatments: | Seeds are placed in a solution of 250 mg/L GA3, soaked for 24 hours, rinsed, and soaked for an additional 4 hours in water. Seeds are sown into trays filled with stabilized medium plugs (Q-plugs). Trays are sealed inside plastic bags and placed into refrigeration at 1 to 3 °C for 60 days. Trays are checked weekly and kept moist throughout the stratification period. If mold is evident, trays should be treated with 1% hydrogen peroxide. | ||
| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Q-plugs are lightly covered with nursery grit. Seedlings are transplanted to target containers approximately 3 weeks following removal from stratification. Growing medium used is 40:20:20:20 peat:composted fir bark:perlite:pumice with Nutricote controlled release fertilizer (18N:6P2O5:8K2O with minors; 180-d release rate at 21C) at the rate of 0.8 gram Nutricote per 164 ml container. |
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| Establishment Phase: | Germination is not very uniform, depending on the quality of the seeds, and can take up to 3 weeks to be complete. Following germination (while still in Q-plugs), plants are fertilized with soluble 12-2-14-6Ca-3Mg at 75 to 100 ppm for 2 weeks. | ||
| Length of Establishment Phase: | 3 weeks | ||
| Active Growth Phase: | During the growing season, fertilization depends on weather and physiological needs. Soluble 20-9-20 NPK, 20-18-18 NPK, or 17-5-24 NPK at 100 to 150 ppm is applied weekly throughout the growing season. | ||
| Length of Active Growth Phase: | 14 weeks | ||
| Hardening Phase: | No dry-down is done to induce dormancy. Seedlings are moved to an outdoor growing area in mid-September. | ||
| Length of Hardening Phase: | 2 to 3 weeks | ||
| Harvesting, Storage and Shipping: |
Harvest Date: Mid-October Storage Conditions: Seedlings are usually outplanted in fall. No storage except in outdoor growing area. Plants are well irrigated prior to shipping and shipped in containers. |
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| References: |
Dorena Genetic Resource Center Propagation Records, unpublished. Lady Bird Johnson Wildflower Center. nd. Penstemon davidsonii Greene. URL: https://www.wildflower.org/plants/result.php?id_plant= PEDA2 (accessed 6 Oct 2018). USDA Natural Resources Conservation Service. Penstemon davidsonii Greene. Davidson's penstemon. URL: https://plants.usda.gov/core/profile?symbol=PEDA2 (accessed 10 Oct 2018). |
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Citation:
Riley, Lee E.; Klocke, Allison. 2018. Propagation protocol for production of Container (plug) Penstemon davidsonii Plants 164 ml (10 in3) container; USDA FS - Dorena Genetic Resource Center Cottage Grove, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/02/24). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
