Butternut Photo Credit: Barb Boysen

Juglans cinerea


  • COSEWIC – Endangered.
  • COSSARO – Endangered.


  • Medium sized tree, it is a member of the walnut family.
  • Distinctive ridged and furrowed ash grey coloured bark.
  • Produces small purplish flowers in the spring.
  • Produces drooping clusters of nuts that have sticky, yellow-green husks.
  • Compound leaves, with 11-17 leaflets. Leaflets are serrated and oblong in shape.
  • Branching alternate.
  • Roots produce a chemical that will kill some nearby plants.


Butternut Oozing Canker Photo Credit: Barb Boysen


  • Likely never common in Ontario, it prefers rich moist soil in fields and forest edges.


  • Butternut canker is an incurable fungal disease that kills the trees within a few years. This fungus was introduced from overseas. It is estimated that 1/3 of Butternut trees in eastern Ontario have died.

Conservation Actions:

  • In Ontario, the Forest Gene Conservation Association has established a Butternut conservation group. They will seek out disease resistant trees to be used to propagate seedlings.
  • If you think you have Butternut trees on your property, please contact the Parry Sound Ministry of Natural Resources at 705-746-4201.

Click here for more information.

Butternut Photo Credit: Barb Boysen

Butternut Photo Credit: Barb Boysen