Astragalus (bourgovii)
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Tara Luna USDI NPS - Glacier National Park West Glacier, Montana 59936 (406) 888-7835 http://plant-materials.nrcs.usda.gov/azpmc |
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| Family Scientific Name: | Fabaceae | ||
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| Family Common Name: | Pea family | ||
| Scientific Name: | Astragalus bourgovii Gray | ||
| Common Name: | Bourgeau's milkvetch | ||
| Species Code: | ASTBOU | ||
| Ecotype: | Limestone talus, Siyeh Bend, Glacier National Park, 2032m elevation. | ||
| General Distribution: | A. bourgouvii occurs in the northern Rocky Mountains, from B.C. and Alberta, south to Montana and west to Shoshone Co., Idaho, on talus and scree slopes in the subalpine to alpine. | ||
| Propagation Goal: | plants | ||
| Propagation Method: | seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | 160 ml conetainers | ||
| Time To Grow: | 8 Months | ||
| Target Specifications: | Stock Type: Container seedling<br> Height: 3 cm<br> Caliper: n/a<br> Root System: firm plug in conetainer. | ||
| Propagule Collection: | Collect mature legumes when they begin to split and turn tan in color. Seeds are brown at maturity. Pods are collected in paper bags and kept in a well ventilated drying shed prior to cleaning. | ||
| Propagule Processing: |
Seeds are hand cleaned at the nursery. Seed longevity is at least 20 years for many species in this genus. Seed dormancy is classified as physical-physiological dormancy. Seeds/Kg: 220,000/kg approx. % Purity: 100% % Germination:12% |
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| Pre-Planting Treatments: |
Fresh seeds were scarified with sandpaper, sown and placed in a 5 month outdoor cold, moist stratification. A hot water treatment for 5 to 20 seconds, immediatel transferred to cool water, and soaked in cool water for 24 to 48 hrs is the recommended treatment for highest germination percentages. |
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| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Outdoor nursery growing facility. Sowing Method: Direct seeding. Seeds are covered with medium. Growing medium used is 6:1:1 milled spaghnum peat,perlite, and vermiculite with Osmocote controlled release fertilizer (13N:13P2O5:13K2O; 8 to 9 month release rate at 21C) and Micromax fertilizer (12%S, 0.1%B, 0.5%Cu, 12%Fe, 2.5%Mn, 0.05%Mo, %Zn) at the rate of 1 gram of Osmocote and 0.20 gram of Micromax per 172 ml conetainer. Conetainers are filled and sown in late fall and irrigated thoroughly prior to winter stratification. Seedlings germinate in spring under fluctuating outdoor temperatures and are grown under full sun exposure. Seedlings are irrigated with Rainbird automatic irrigation system in early morning until containers are thoroughly leached. Average growing season of nursery is from late April after snowmelt until October 15th. |
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| Establishment Phase: | Medium is kept slightly moist during germination. True leaves emerge in mid May. | ||
| Length of Establishment Phase: | 4 weeks | ||
| Active Growth Phase: |
Root development occurs rapidly following germination. 4 to 6 true leaves were evident in a tight rosette 6 weeks after germination. Plants were fertilized with 13-13-13 liquid NPK at 100 ppm at this stage. |
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| Length of Active Growth Phase: | 12 weeks | ||
| Hardening Phase: | Seedlings are hardened off for two weeks prior to outplanting. | ||
| Length of Hardening Phase: | 2 weeks | ||
| Harvesting, Storage and Shipping: |
Total time to Harvest: 8 months Harvest Date: August No storage; outplanted the first year. |
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| Length of Storage: | 5 months | ||
| Other Comments: | Astragalusspecies benefit from Rhizobium inoculation, as the majority of species in this genus are reported to as nodulating legumes. | ||
| References: |
Flora of the Pacific Northwest, Hitchcock and Cronquist, 7th edition, University of Washington Press, 1973. Seeding Rate Statistics for Native and Introduced Species, Hassell, Wendel,U.S.D.I. and U.S.D.A., April 1996. Seeds: Ecology, Biogeography, and Evolution of Dormancy and Germination, Baskin and Baskin, Academic Press, 1998. Seed Germination Theory and Practice, Deno, Norman, Penn State University, 1993. Glacier National Park Native Plant Nursery Propagation Records, unpublished. The Leguminosae: A Sourcebook of Characteristics, Uses, and Nodulation, Allen and Allen, University of Wisconsin Press, 1981. |
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Citation:
Luna, Tara; Evans, Jeff; Wick, Dale. 2008. Propagation protocol for production of Container (plug) Astragalus bourgovii Gray plants 160 ml conetainers; USDI NPS - Glacier National Park West Glacier, Montana. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2024/05/18). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
