Juglone tollerent plants - Ask Extension
Would you please clarify shrubs that ARE tolerant of Juglone. I have a mature Pecan tree in a sunny location which I would like to plant Hydrangea pla...
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Juglone tollerent plants #390869
Asked March 29, 2017, 2:56 PM EDT
Would you please clarify shrubs that ARE tolerant of Juglone. I have a mature Pecan tree in a sunny location which I would like to plant Hydrangea plants that get to be around 4 feet tall. I could use other Hydrangeas if pruning would keep them in check. I have read online that all Hydrangeas are not tolerant of Juglong. I have talked to nursery folk and just about no one even heard of Juglone. It's very discouraging.
I have searched the internet and found conflicting opinions so I decided to ask you because your site states that Snowball Hydrangeas will be OK to plant under even a Black Walnut. Would you please please provide your opinion as to which shrubs would work, specifically Hydrangeas (scientific names), or other shrubs.
I'm in Georgia, north of Atlanta in zone 7 and the dirt is clay.
Also would a soil amendment high in composted chicken such as Hoganix work.
Thank You so much,
Jim Taylor
Woodstock, GA
Cherokee County Georgia
Expert Response
Hello,
Penn State reports pecan trees, Carya illinoinensis, produce lower amounts of Juglone than black walnut and other species of nut trees in the Juglandaceae family.
According their published information, http://extension.psu.edu/plants/gardening/fact-sheets/trees-shrubs/landscaping-and-gardening-around-...,, rarely does the amount of juglone from pecan trees affect other plants. They also say Snowball Hydrangea (Hydrangea arborescens) is tolerant of Juglone.
Ontario also has a good fact sheet stating low levels of juglone from pecans.
http://www.omafra.gov.on.ca/english/crops/facts/info_walnut_toxicity.htm
The University of Georgia Extension Office should be able to give you local information on pecan culture from their extensive pecan research program. See their website and contact info at the link. http://extension.uga.edu/agriculture/ag-fruits-vegetables/pecans/
Regards,
Carol Quish
Penn State reports pecan trees, Carya illinoinensis, produce lower amounts of Juglone than black walnut and other species of nut trees in the Juglandaceae family.
According their published information, http://extension.psu.edu/plants/gardening/fact-sheets/trees-shrubs/landscaping-and-gardening-around-...,, rarely does the amount of juglone from pecan trees affect other plants. They also say Snowball Hydrangea (Hydrangea arborescens) is tolerant of Juglone.
Ontario also has a good fact sheet stating low levels of juglone from pecans.
http://www.omafra.gov.on.ca/english/crops/facts/info_walnut_toxicity.htm
The University of Georgia Extension Office should be able to give you local information on pecan culture from their extensive pecan research program. See their website and contact info at the link. http://extension.uga.edu/agriculture/ag-fruits-vegetables/pecans/
Regards,
Carol Quish
