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Rudbeckia (occidentalis)

Lee Riley
Horticulturist
USDA FS - Dorena Genetic Resource Center
34963 Shoreview Road
Cottage Grove, Oregon 97424
541-915-7324
541-767-5709 (fax)
leriley@fs.fed.us
Family Scientific Name: Asteraceae
Family Common Name: Aster
Scientific Name: Rudbeckia occidentalis
Common Name: western coneflower
Species Code: RUOC2
Ecotype: Umpqua National Forest, Oregon
General Distribution: Western United States
Propagation Goal: Plants
Propagation Method: Seed
ProductType: Container (plug)
Stock Type: 262 ml (16 in3) container
Time To Grow: 15 weeks
Target Specifications: Stock Type: Container seedling Root System: Firm plug in container.
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 90 days.
It is very important to check seeds weekly. If mold is evident, seeds should be treated with 1% hydrogen peroxide.
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.
Establishment Phase: Germination is somewhat uneven, and may take up to 3 weeks to be complete. Following germination, plants are fertilized with soluble 12-2-14-6Ca-3Mg at 75 ppm for 1 week.
Length of Establishment Phase: 3 weeks
Active Growth Phase: Seedlings grow rapidly throughout the active growth phase. During the growing season, fertilization depends on weather. Soluble 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: 12 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 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.
Other Comments: Wetland classification: FAC
References: Dorena Genetic Resource Center Propagation Records, unpublished.

USDA Natural Resources Conservation Service. Rudbeckia occidentalis Nutt. western coneflower. URL: https://plants.usda.gov/core/profile?symbol=RUOC2 (accessed 10 Oct 2018).

Citation:

Riley, Lee E.; Klocke, Allison. 2018. Propagation protocol for production of Container (plug) Rudbeckia occidentalis Plants 262 ml (16 in3) container; USDA FS - Dorena Genetic Resource Center Cottage Grove, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2024/07/22). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.