Polygonum (shastense)
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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: | Polygonaceae | ||
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| Family Common Name: | Buckwheat | ||
| Scientific Name: | Polygonum shastense | ||
| Common Name: | Shasta knotweed | ||
| Species Code: | POSH | ||
| Ecotype: | Crater Lake National Park | ||
| General Distribution: | Lower 48 states | ||
| Propagation Goal: | Plants | ||
| Propagation Method: | Seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | 262 ml (16 in3) container | ||
| Time To Grow: | 20 weeks | ||
| Target Specifications: | Stock Type: Container seedling Root System: Firm plug in container. | ||
| Pre-Planting Treatments: |
Seeds are placed into fine mesh bags and soaked in a 1% hydrogen peroxide (3:1 water/3% hydrogen peroxide) 24 hours, rinsed, and placed in water for an additional 24 hours. Seeds are layered in peat and placed into cold stratification (1 to 3 °C) for 60 days. It is very important to check seeds in peat weekly. If mold is evident, seeds should be treated with 1% hydrogen peroxide. |
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| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Greenhouse growing facility. Seeds are directly sown into containers. Seeds are lightly covered with nursery grit. Growing medium used is 40:20:20:20 peat:composted fir bark:perlite:pumice with Apex controlled release fertilizer (16N:5P2O5:10K2O with minors; 6 to 7 month release rate at 21C) at the rate of 1.5 gram Apex per 262 ml container. | ||
| Establishment Phase: | Germination is slow and uneven, and can take up to 3 weeks to be complete. During that time, plants may be lightly fertilized with soluble 12-2-14-6Ca-3Mg at 75 ppm. | ||
| Length of Establishment Phase: | 4 weeks | ||
| Active Growth Phase: | Plants are slow-growing, and may die back if over-irrigated. Pay careful attention to water use. Soluble fertilizer (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: | 16 weeks | ||
| Hardening Phase: | No dry-down is done to induce dormancy. Seedlings are moved to an outdoor growing area in early September. | ||
| Length of Hardening Phase: | 3 to 4 weeks depending on chilling hours | ||
| Harvesting, Storage and Shipping: |
Harvest Date: Mid to late 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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| Other Comments: |
Found in California, Nevada, and Oregon. Prennial shrub. Prefers rocky or gravelly slopes. Grows from 6900-12000 feet. Grows in the subalpine. |
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| References: |
Dorena Genetic Resource Center Propagation Records, unpublished. The Jepson Herbarium. University of California, Berkley. Polygonum shastense. URL: https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=39288 (Accessed 5 January 2024). Lady Bird Johnson Wildflower Center. Polygonum shastense W.H. Brewer. URL: https://www.wildflower.org/plants/result.php?id_plant=POSH (Accessed 5 January 2024). USDA Natural Resources Conservation Service. Polygonum shastense W.H. Brewer. URL: https://plants.usda.gov/home/plantProfile?symbol=POSH (Accessed 5 January 2024). |
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Citation:
Riley, Lee E.; Klein, Kassandra. 2024. Propagation protocol for production of Container (plug) Polygonum shastense Plants 262 ml (16 in3) container; USDA FS - Dorena Genetic Resource Center Cottage Grove, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/06/17). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
