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New Native Shrubs Show Promise for Landscape, Nursery Industries:
Propagation study shows novel native species have potential as wholesale nursery additions
Cartabiano and Lubell evaluated the impact of cutting timing on propagation success of the four native shrubs. They found that timing had no significant effect on rooting percentage, root count, or root length of Corylus cornuta or Viburnum acerifolium. "Some growers have reported difficulty propagating Viburnim acerifolium," noted corresponding author Jessica Lubell. "However, we found it to be the easiest shrub to propagate of the four natives evaluated, and therefore it has the most obvious potential to be a mainstream nursery crop. Nearly 100% rooting can be achieved with V. acerifolium cuttings containing two nodes taken mid-June through mid-August."
Another standout in the study was Corylus cornuta, which the researchers said can be propagated at 85% rooting or greater when cuttings are taken mid-June to mid-August and treated with indole-3-butyric acid at 3000 ppm. "Our results indicated that Corylus cornuta, in addition to Viburnum acerifolium, has the potential to be a new nursery crop," Lubell said.
The study recommends that rooted cuttings of both Corylus cornuta and Viburnum acerifolium should be left in rooting containers for a period of cold dormancy before transplanting in order to optimize cutting survival. "Growers who overwinter their C. cornuta and V. acerifolium in the container in which they were rooted can expect close to 100% survival," noted Lubell. They advised that fall transplanting will likely result in 50% attrition, thus reducing the potential for the species to be viable in commercial nursery environments.
Cartabiano and Lubell said that, although Corylus cornuta and Viburnum acerifolium showed the most promise as commercially viable nursery crops, further propagation research could validate all four of the native species in the study as recommended crops for general wholesale nurseries.
The complete study and abstract are available on the ASHS HortScience electronic journal web site: http://hortsci.ashspublications.org/content/48/8/1018.abstract
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