
Carya hickory sections. All images © Jonas Frei, shared with permission
During a visit to the Zürich arboretum,
Based in Schaffhausen, Frei is a naturalist, illustrator, and landscape architect whose interest in botany has taken him to gardens, arboretums, and parks throughout Europe and North America. He recently spent time in Harvard’s
Shared through illustrations and flat-lay photos, Frei’s studies have recently culminated in a book devoted to walnuts and hickories, which brings together the cultural, historical, and botanical importance of these diverse plants. “I was driven not only by my scientific interest in Juglandaceae but also by my enthusiasm for the aesthetics of their habits, leaves, and fruits. The readers of my book should be able to make their own journey of discovery through the walnut family, on the tracks I have uncovered with my research,” he says.
The expanded edition of Frei’s book, which includes updates from his studies at Arnold Arboretum, is available along with posters, prints, and a similar volume focused on hazelnuts on

Juglans sinesis

Juglans nigra

Junglandaceae

Corylus

Walnusshaelften
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