- 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.
- 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.
- 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.