Walnut Trees, Friend or Foe

Walnut Trees, Friend or Foe CAROL SHIRK CERTIFIED MASTER GARDENER Black walnut trees (Juglans nigra) and butternut trees, also called white walnut trees (Juglans cinerea) are commonly recognized by gardeners as having a toxic trait. They contain juglone, concentrated primarily in their buds, leaves, stems, nut hulls, and roots. This chemical spells trouble for many surrounding plants, causing