Oak (Quercus) hybrids were created using over 40 diverse parent species. The developed hybrids were used as stock plants and asexually propagated annually over 4 years. This was done to measure the effectiveness of a modified stool bed layering technique on diverse members of the oak genus, and this study is part of a long-term project to select superior urban-tolerant oak hybrids for introduction as named cultivars into the nursery industry. The number of shoots produced by a stock plant each year and the probability for those shoots to root were found to vary between different maternal parent species. Results suggest the shoots of the hybrids that are the progeny of rhizomatous shrub Quercus spp. are more likely to develop roots when propagated using the described technique. This article also identifies and describes in detail a reliable technique for cloning oaks.
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