Buckthorn - An Alien Invader

Buckthorn - An Alien Invader:

European or common buckthorn (Rhamnus cathartica) is an invasive species that is crowding out many native plants in our woodlands. This fast growing treelike shrub not only blocks out light and produces enzymes that destroy native plants, it also can be a host for crown rust spot which destroys soy bean crops and helps the growth of Asian lady beetles. Working together, we can help exterminate this alien invader.

Alien Fun Facts

Alien Fun Facts

Q: How important is it for Wisconsin landowners to step up and remove alien species?

A: Very, according to the Wisconsin Department of Natural Resorces, 85% of land in Wisconsin is privately owned.


Only female buckthorn bushes produce berries. These have a toxin that can kill the birds who eat them.

Buckthorn has orange heartwood. This should be checked along the trunk as smaller branched do not show this.

Removing buckthorn is harder than doing homework.

Most people do nothing because they say they don't have the time.


Wednesday, February 2, 2011

Alien Identification - Winter

Buckthorn is a highly invasive species with twigs that are positioned on opposite sides of the branches. The bark is silvery brown with reddish tones on the smaller twigs. Twigs often end in sharp thorny tips.

Buckthorn can be found in the winter by using the description above. To make sure that what you have found is really buckthorn, all you have to do is go outside to the shrub or tree and use a kitchen knife to cut a little piece of the bark. If the heartwood is an orange color when you look at the cut, you have found Buckthorn. See the included pictures to help you with identification.




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