Propagation of Juniperus for Conservation Plantings
Investigators (most current known information)
Rocky mountain juniper and eastern red cedar are important species for conservation plantings in the Intermountain region. These species exhibit slow and variable seed germination and a long production cycle, often preventing nurseries from meeting the demand. This project was initiated, in part, to examine an alternative production method using vegetative propagation. The vegetative propagation portion of the project had two objectives, one, to examine the influence of several factors known to impact rooting of stem cuttings in other conifer species; and two, to address the potential logistical questions involved in a large-scale vegetative propagation program. Crown position, branch position, plant growth regulator level and harvest date were evaluated on a range of sources from throughout the Great Plains region. The stock plants were 13-year-old select plants from a series of regionwide progeny tests. Overall, cuttings from these trees did not root well. Variability was seen by species, site collected and individual tree.
However, cuttings from some individual trees did root well for one or more collections. The study for the second phase of the project involved rooting of cuttings from young stock plants (less than three years) in various sized containers to examine influence of container size and density of cuttings on the propagation bench on rooting cuttings.
Cuttings from these plants rooted well with an average of 92% rooting for eastern red cedar and 69% for Rocky Mountain juniper.
Articles in Journals
Wagner, A.M., J.T. Harrington, J.G. Mexal and J.T. Fisher. 1994. "Progress report on propagation of junipers for conservation plantings." In Proceedings: Intermountain Nursery Conference, 131-136. St. Louis MO.
Wagner, A.M., J. T. Harrington, J.G. Mexal and J.T. Fisher. 1992. "Rooting of junipers in outdoor nursery beds." In Proceedings: Intermountain Nursery Conference, 120-123. Park City UT.