Arborvitae Producing Cones? - Ask Extension
We have 8 arborvitae in our yard planted at various times. The smaller one look different than the others with what appears to be some sort of come li...
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Arborvitae Producing Cones? #875696
Asked July 02, 2024, 3:35 PM EDT
We have 8 arborvitae in our yard planted at various times. The smaller one look different than the others with what appears to be some sort of come like material on the tips of the branches. This is their third year in our yard and the first time we have seen this growth. Wondering what it is and if it is anything to be concerned about. The third photo shows one of the older trees. Thank you.
Hamilton County Ohio
Expert Response
Thank you for your question about the cone-like structures on your arborvitae shrubs. There are a couple of options that come to mind. The first is bagworms, which is a pest that uses the material from the tree (in this case needles) to form a nest-type structure that hangs from the tree. Here's a photo and some information about bagworms:
https://extensionpubs.unl.edu/publication/g1951/na/html/view
I do believe that what you are seeing are the cones from your Eastern arborvitae trees (Thuja occidentalis). Please follow this link to note the similarity:
https://garden.org/plants/photo/494301/
Since you planted your arborvitae at different times I am wondering if it is possible that you planted different varieties, which would cause differences in size and habit. Trees start producing cones as they mature, usually after about six years.
Here's an OSU fact sheet about Eastern arborvitae with additional information:
https://plantfacts.osu.edu/tmi/Plantlist/th_talis.html
https://extensionpubs.unl.edu/publication/g1951/na/html/view
I do believe that what you are seeing are the cones from your Eastern arborvitae trees (Thuja occidentalis). Please follow this link to note the similarity:
https://garden.org/plants/photo/494301/
Since you planted your arborvitae at different times I am wondering if it is possible that you planted different varieties, which would cause differences in size and habit. Trees start producing cones as they mature, usually after about six years.
Here's an OSU fact sheet about Eastern arborvitae with additional information:
https://plantfacts.osu.edu/tmi/Plantlist/th_talis.html
Dear Karen,
Thanks for your quick response. I agree now that I compare the photos that is it the cones, and it is likely the difference in variety.
And happy 4th to you!
