Allyson Levy and Scott Serrano run Hortus Arboretum in upstate New York. Unusually for a botanic garden it is privately run, as a non-institutional not-for-profit foundation, aiming to conserve a wide range of native and non-native plant species that flourish in the Hudson Valley. Allyson and Scott have also published a book – Cold Hardy Fruits and Nuts. https://www.chelseagreen.com/product/cold-hardy-fruits-and-nuts/