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, September 14, 2011

The Red Planet

As autumn progresses and turns our world to shades of red, look for buckthorn to standout as a summer hold out. Buckthorn can keep it's gree leaves late into the fall making it the perfect time to spray the foliage. Wait until surrounding leaves have fallen to prevent damaging other plants then use a herbicide like triclopyr 4 mixed with water. Spay onto leaves. Look for berry producing trees first. These should be cut and burned to prevent the spreading of seeds. Basil bark and cut stump methods also work during the fall as the plants pull nutrients and the herbicides deep into the roots for winter.

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