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Collomia (grandiflora)

Amy Bartow
Seed and Plant Production Manager
USDA NRCS - Corvallis Plant Materials Center
3415 NE Granger Ave
Corvallis, Oregon 97330
(541) 757-4812 ext 103
(541) 757-4733 (fax)
amy.bartow@or.usda.gov
http://plant-materials.nrcs.usda.gov/orpmc
Family Scientific Name: Polemoniaceae
Family Common Name: Phlox family
Scientific Name: Collomia grandiflora Lindley Ann
Common Name: grand collomia
Species Code: COGR4
Ecotype: Seeds were collected in Lane Co. near Eugene.
Propagation Goal: plants
Propagation Method: seed
ProductType: Container (plug)
Time To Grow: 0
Propagule Collection: Entire plants were cut off at the base when top seeds shatter. Plants were placed in a screen-covered container and left to dry.
Propagule Processing: Seeds were cleaned using an air-screen machine.
Pre-Planting Treatments: Seeds were sown into cone-tainers filled with Sunshine #1 (a soil-less peat-based media) amended with micro-nutrients (Micromax) and a slow release fertilizer (Osmocote 14-14-14). The flats of cone-tainers were covered with poly-ethylene bags and placed in a walk-in cooler (35-40 degrees) for 4 weeks
Growing Area Preparation/
Annual Practices for Perennial Crops:		 Flats were removed from the cooler after 4 weeks and placed in a greenhouse set at moderate temperatures (70 degrees days/50 degrees nights).
Other Comments: One flat of cone-tainers sown with seeds ("control flat") was placed in the greenhouse without any cold-moist stratification. No seeds germinated. Flats placed in cooler for 45 days had 95% germination. A two-week cold period may be sufficient to break dormancy, fresh seed will also germinate in the fall.

Citation:

Bartow, Amy L. 2003. Propagation protocol for production of Container (plug) Collomia grandiflora Lindley Ann plants USDA NRCS - Corvallis Plant Materials Center Corvallis, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/04/20). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.