Fig. 2. Of the hardwood species considered for temperate silvopastures and multi-cropping systems, black walnut has received the most attention. Black walnut produces both high-value wood and generates an annual nut crop. Management for either or both outputs is possible; the chosen strategy will depend on producer objectives and local markets, among other factors (76).

Image from Forage and Grazinglands article:
Considerations for Establishing and Managing Silvopastures