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The Forest Service National Center for Reforestation, Nurseries, and Genetic Resources (RNGR) is a leading source of technical information for nurseries and land managers regarding production and planting of trees and other native plants for reforestation, restoration, and conservation.

 
NPN Protocol Details Image

Coreopsis (pubescens)

Jill Barbour
Germination Specialist
USDA FS - National Seed Laboratory
5675 Riggins Mill Rd.
Dry Branch, Georgia 31020
478-751-3553
478-751-4135 (fax)
jbarbour@fs.fed.us
www.nsl.fs.fed.us
Family Scientific Name: Asteraceae
Family Common Name: Aster
Scientific Name: Coreopsis pubescens Ell.
Common Name: star tick seed
Propagation Goal: seeds
Propagation Method: seed
ProductType: Propagules (seeds, cuttings, poles, etc.)
Stock Type: seed cleaning techniques
Time To Grow: 0
Propagule Processing: Five seedlots were run througth the Westrup Brush Machine once and a sixth seedlot was run three times at speed 11 to separate the seeds from the flowers. Medium stiff brushes and a coarse shell were used. The seed came out the chute end of the machine.
One seedlot was not aspirated but sticks were removed with a 9.5/64 inch round hole screen.
Three seedlots were aspirated at a vacuum of 0.02 inches of water column to remove light weight trash. Each of the seedlots received a different treatment after aspiration. Larger trash from the first of the three seedlots was removed with a 8.5/64 inch round hole screen, a 5.5/64 x 1/2 inch slotted screen, and a 4.5 x 1/2 inch slotted screen and fine material passed through a soil sieve number 0.0787.
The second out of three seedlots was cleaned with an indent cylinder size 24/64 inch holes to remove trash longer than the seeds. The third seedlot, which went through the brush machine 3 times, was cleaned with a 70/1000 inch round hole screen, a 6.5/64 inch round hole screen, and a soil sieve with measurement 0.0394.

The fifth seedlot was aspirated 3 times at 0.01 inches of water column to remove light weight trash. A 42/1000 inch slotted screen was then used.
The sixth seedlot was aspirated one time at 0.01 inches of water column followed by an 8.5/64 inch round hole screen to remove larger material.

Citation:

Barbour, Jill R; Johnson, Gary; Karrfalt, Bob; Kaufmann, Gary. 2007. Propagation protocol for production of Propagules (seeds, cuttings, poles, etc.) Coreopsis pubescens Ell. seeds seed cleaning techniques; USDA FS - National Seed Laboratory Dry Branch, Georgia. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2024/07/01). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.