Juglans nigra

Eastern Black Walnut

 

Wheatland (Tanger Arboretum), 1120 Marietta Avenue, Lancaster PA (along upper driveway)

 

One of the county’s nicer Black Walnuts, with a trunk circumference at breast height of about 11 feet in 2018. Estimating this tree’s age by formula gives an age of up to 190 years. President James Buchanan purchased Wheatland in 1828, 190 years ago.

 

This amazing species excretes chemicals into the soil that inhibit growth by other plants.  Some 1,950 years ago, Pliny the Elder observed that “the shadow of walnut trees is poison to all plants within its compass.”