Norway Spruce & juglone

Asked July 31, 2016, 8:32 AM EDT

Is Norway Spruce tolerant of black walnut juglone? I've found many sources online that contradict each other in the matter and some have the Norway Spruce listed under "Tolerant" and "Susceptible" within the same document. Thank you for your help :-)

Hennepin County Minnesota norway spruce

4 Responses

You're correct - an entire gamut of answers.

The Minnesota Extension site doesn't mention Norway spruce in either its tolerant or non-tolerant list.

The Morton Arboretum site lists it as sensitive. This site is considered to be extremely trustworthy.

One of our very well known Minnesota nurseries (you can easily guess which it is and check out the site) also lists it as sensitive. The reputation of this nursery is such that it is unlikely they would make a mistake in something that would prove to be very costly.

For those reasons, I recommend that you consider the Norway spruce not tolerant of juglone.

Thank you, Karen! I appreciate your advice and won't use a Norway Spruce. We're trying to block a rather large tree house from our deck and the gap in the tree line is partially shaded space and close to a couple of black walnut trees. Is there an evergreen? If not, do you have a recommendation for a deciduous tree with relatively fast growth and coverage?
Thanks in advance for any help!
Diana

Take a look at:

http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/toxicity-of-black-walnuts-towards-other-plants/

What about the red cedar? It has a medium growth rate. It's really a juniper. It's a Minnesota native. It desires full sun but will grow in partial shade.

Thanks, Karen!!
It's nice looking too :-)