Rusty blackhaw, Viburnum rufidulum Ames 25098, is a slow growing ornamental shrub that is prized for its glossy foliage, good fall color, and cold hardiness. Nursery staff have reported that it can be propagated readily by softwood (SO) stem cuttings but that it transplants poorly, and field production is often very slow. The objectives were to assess the growth characteristics of this selection in comparison with V. lantana and V. dentatum and to determine if these faster growing viburnums, used as rootstocks, could stimulate faster V. rufidulum (scion) shoot growth.
Iowa State University
Stephens, Loren C., "Clonal Propagation and Field Production of Rusty Blackhaw Ames 25098, a Promising Ornamental Shrub for Landscaping" (2010). Iowa State Research Farm Progress Reports. 324.