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.


Tuesday, March 1, 2011

Area 51 - Highlights from our talk with an expert

Recently, we were able to interview Jack Rasmussen, a woodland activist, about some of the dangers in ignoring the spread of buckthorn.
Landowners need to know that buckthorn is a serious threat. Buckthorn stops native trees and plants from developing new growth and chokes out smaller plants.  If landowners do not stop buckthorn, the woodlands in St. Croix County will eventually die off. We need to stop the shift from native to exotic by removing buckthorn and restoring native plants.
Some people think that the female buckthorn berries are good for the birds who eat them. However, the berries contain a toxin that acts as a laxative. Not only does this help spread the seeds, it is damaging to the birds and sometimes kills them. Once the seeds have been excreted, they can remain viable for up to five years in the soil.
"Buckthorn is the Eurasian milfoil of our woodlands." - Jack Rasmussen
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