We conducted a greenhouse study in which 'Hobble Creek' mountain big sagebrush (Artemisia tridentata ssp. vaseyana) seeds were planted at various depths in soil to determine the optimal planting depth. Results showed that the optimal planting depth is 5 mm or less.
Jacobson, Tracy L. C. and Welch, Bruce L.
"Planting depth of 'Hobble Creek' mountain big sagebrush seed,"
Great Basin Naturalist: Vol. 47
, Article 13.
Available at: http://scholarsarchive.byu.edu/gbn/vol47/iss3/13