2012 Virginia Plant Exploration Trip

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2012 Virginia Plant Exploration Trip

On a short expedition from October 20–24 2012, Michael Dosmann, Curator of Living Collections at the Arnold Arboretum, ventured to Virginia with Anthony Aiello (Morris Arboretum of the University of Pennsylvania) in pursuit of southern live oak, Quercus virginiana. Although the arboretum has cultivated other species from this region before, it had never attempted this particular tree. No doubt, its absence from the living collections is because the southern live oak is native to climates much different from that of New England, suggesting that it was not even worth the attempt. Yet, there are numerous examples of trees able to withstand the vagaries of New England’s winters, despite their more southern origins. They key for their success and survival often lies in selecting the right populations, typically the northern-most. Specifically, Aiello and Dosmann’s inspiration for obtaining the hardy southern live oak came from C.S. Sargent’s findings that the cedar-of-Lebanon1 had proved perfectly hardy for Boston, when gathered from the severer climate in Turkey.

During this trip, the two collected along the southeastern edge of Virginia, stopping in Richmond, Williamsburg, Norfolk, Hampton, and Virginia Beach, including the campuses of the University of Richmond, the College of William and Mary, and trips to Fort Monroe and First Landing State Park. These represented a combination of wild, and cultivated, trees, but all of which had withstood occasionally severe winters over the past century.

They collected acorns as well as herbarium vouchers from cut twigs, and across all areas they came upon an incredible variety of southern live oaks. Most notably, when visiting Fort Monroe near Hampton, they encountered the Algernourne Oak, a tree speculated to be over 450 years old, with a 90-inch diameter, a 100 foot spread, and a height of 60 feet. And while in Williamsburg, with help from Beth Chambers (curator of the herbarium at the College of William and Mary), Aiello and Dosmann happened upon and collected from a very large Compton oak (Quercus × comptoniae), a hybrid between Q.virginiana and Q. lyrata (overcup oak).

In addition to their Quercus virginiana collections, Aiello and Dosmann also collected devilwood (Osmanthus americanus) and swamp bay (Persea palustris) at First Landing State Park on Cape Henry (between Norfolk and Virginia Beach). These two species are also temperamental when grown in colder regions, but this more northern-source may yield some cold-hardy types.

Overall, the short expedition was a success. Aiello and Dosmann left Virginia with twelve separate Q. virginiana collections, plus one each of the Persea, Osmanthus, and Q. × comptoniae. In 2016, the first oaks were planted out into the living collections at both of the arboreta, in both protected micro-climates as well as more exposed sites. With luck, some of these will prove to be hardy in their new homes.

Additional Resources

1Aiello, A. S. and M. S. Dosmann. 2007. The quest for the hardy cedar-of-Lebanon. Arnoldia 65(1): 26–35. [pdf]

Dosmann, M.S., & A. S. Aiello. 2013. The Quest for the Hardy Southern Live Oak. Arnoldia 70(3):12-24. [pdf]