Asclepias (cordifolia)
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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: | Asclepiadaceae | ||
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| Family Common Name: | Milkweed | ||
| Scientific Name: | Asclepias cordifolia | ||
| Common Name: | Heart-leaf milkweed | ||
| Species Code: | ASCO | ||
| Ecotype: | Rogue River-Siskiyou National Forest, Oregon | ||
| General Distribution: | Oregon, California, Nevada. Heart-leaf milkweed occurs on rocky slopes, talus, woods, chaparral, mixed evergreen forest, and lava flows, at elevations from 50 to 2000 m. | ||
| Propagation Goal: | Plants | ||
| Propagation Method: | Seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | 262 ml (16 in3) container | ||
| Time To Grow: | 16 weeks | ||
| Target Specifications: | Stock Type: Container seedling Root System: Firm plug in container. | ||
| Propagule Collection: | Collect seeds after pods have ripened, but before they have split open. The seeds are wind dispersed, so be careful when gathering to place in a paper or burlap bag to avoid losing them. | ||
| Pre-Planting Treatments: |
Seeds are placed in fine mesh bags into a 1% hydrogen peroxide (3:1 water/3% hydrogen peroxide) soak for 24 hours, rinsed, and placed in water for an additional 24 hours. The bags are placed in sealed containers in refrigeration at 1 to 3 °C for 45 days. It is very important to check seeds 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 Nutricote controlled release fertilizer (18N:6P2O5:8K2O with minors; 180-d release rate at 21C) at the rate of 1.5 gram Nutricote per 262 ml container. |
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| Establishment Phase: | Germination is fairly uniform and is usually complete in 10 to 14 days. Following germination, plants are fertilized with soluble 12-2-14-6Ca-3Mg at 75 ppm for 1 week. | ||
| Length of Establishment Phase: | 2 to 3 weeks | ||
| Active Growth Phase: | Seedlings grow rapidly throughout the active growth phase. During the growing season, fertilization depends on weather. Soluble fertilizer (20-9-20 NPK, 20-18-18 NPK, or 17-5-24 NPK) at a rate of 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 early to mid September. | ||
| Length of Hardening Phase: | 2 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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| Other Comments: |
Heart-leaf milkweed requires sun and porous soil, and can tolerate moderate amounts of water during its growing period. Length of storage for seed viability has not been determined. |
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| References: |
Dorena Genetic Resource Center Propagation Records, unpublished. USDA NRCS National Plant Data Center. 2006. Purple milkweed Asclepias cordifolia Benth. URL: https://plants.usda.gov/plantguide/pdf/cs_asco.pdf (accessed 9 Oct 2018). |
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Citation:
Riley, Lee E.; Klocke, Allison. 2018. Propagation protocol for production of Container (plug) Asclepias cordifolia Plants 262 ml (16 in3) container; USDA FS - Dorena Genetic Resource Center Cottage Grove, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/11/03). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
