Cirsium (occidentalis)
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Betty Young Nurseries Sr Manager Bldg 201, Fort Mason San Francisco, California 94123 415-331-6917 415-331-7521 (fax) byoung@ggnpa.org |
| Family Scientific Name: | Asteraceae | ||
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| Family Common Name: | Sunflower Family | ||
| Scientific Name: | Cirsium occidentalis (Gray) | ||
| Common Synonym: | Cirsium californicum (Gray) | ||
| Common Name: | Cobweb Thistle | ||
| Species Code: | CIROCC | ||
| Ecotype: | Marin County, California | ||
| General Distribution: | C. occidentalis is found in sandy places, from Mendicino County to Monterey County and San Miguel, Santa Rosa and Santa Cruz islands, California. | ||
| Propagation Goal: | plants | ||
| Propagation Method: | seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | Deepot 16 | ||
| Time To Grow: | 0 | ||
| Target Specifications: | Height: N/A<br> Caliper: N/A<br> Root System: Firm plug in container. | ||
| Propagule Collection: |
Seeds are collected between April 1st and June 1st. Mature inflorescences are brown and pappus is silver and beginns to fluff out. Collect early to avoid seed predatiob by weevils. |
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| Propagule Processing: |
Seed Cleaning: Seeds are pulled from heads and rubbed over a screen to remove the pappus. Storage Conditions: Seeds are kept dry and stored in a refrigerator. Seeds/gram: 111 |
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| Pre-Planting Treatments: | Soak fresh seeds overnight in frsh water and stratify for 2 weeks or until seeds begin to germinate. | ||
| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Fully Controlled Greenhouse. Sowing Method: Transplanting Germinants. 8 grams of seeds are sown per flat containing Sunshine Mix #4 Aggregate Plus (peat moss, perlite, major and minor nutrients, gypsum, and dolomitic lime). Seeds are covered with media. Flats are watered in with an automatic irrigation system and misted as needed. Remove from mist as soon as first leaves appear; Cirsium leaves rot easily. Seeds are sown on July 1st. % Germination:50% |
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| Establishment Phase: |
Seeds germinate 14 days after sowing. Seedlings are transplanted 14 days after germination to individual containers 2"x7" tubes (Deepot 16) containing standard potting mix of peat moss, fir bark, perlite, and sand. Transplant Survival averages 90%. |
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| Length of Establishment Phase: | 1 month | ||
| Active Growth Phase: | Fertilize with Nutricote (NPK 13-13-13) 3 months after transplanting. Be careful not to over fertilize; lush foliar growth attracts aphids. | ||
| References: | A California Flora and Supplement, Munz, P., University of California Press, Berkeley and London, 1973. | ||
Citation:
Young, Betty. 2001. Propagation protocol for production of Container (plug) Cirsium occidentalis (Gray) plants Deepot 16; San Francisco, California. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/04/25). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
