White Fir and juglone
Balsam fir may be resistant to juglone. There were no reports on other firs. The following trees are tolerant to juglone.
Arborvitae Thuja sp.
Canadian Hemlock Tsuga canadensis
Chinese Juniper Juniperus chinensis
Red Cedar Juniperus virginiana
Does this mean you saw a citation or experience of a/some balsams being tolerant? I am not sure how to interpret 'may be' .
Thank you so much!
This is a helpful list. https://www.johnson.k-state.edu/docs/lawn-and-garden/in-house-publications/trees-shrubs/Landscaping%20Near%20Black%20Walnut%20Trees.pdf
The citations are also excellent. I am afraid this is the best I can find.
Thank you for the question