Extension Logo
Extension Logo
University of Minnesota Extension
extension.umn.edu

Chaga - a delicious find in the winter woods

Chaga on a birch tree.

Minnesota is home to the ingredients for a folk remedy often used for medicinal purposes. Chaga is a fungus that takes the form of a conk, the spore producing fruiting structure of the fungus.

Chaga (also called the clinker polypore) is a popular folk remedy for various illnesses. Chaga and similar products have even been marketed in Russia and Japan as being anti-cancer drugs. Most people in Minnesota incorporate it into teas for medicinal purposes.

How to find and identify chaga

Chaga can be found on birch trees in forests across central and northern Minnesota. It can also be found on aspen, alder and elm trees.

Chaga can be found year round, but it is most noticeable in the winter when there are few leaves. The black, charcoal-like mass sticks out on birch trees in forests in the winter.

The conk of the chaga can be up to 30 inches long and 20 inches wide. The conk is found at a wound in the tree. Trees with chaga conks are likely dead or are in the process of dying.

The surface of the conk is a charcoal-like color and extremely hard. The interior of the conk is a copper or reddish brown color.

How to harvest chaga

A chunk of chaga showing the inside of a chaga conk.

The conk of chaga can be harvested with a hatchet or hammer. Removing the conk does not harm the tree, as it is likely already dead or dying. Once harvested, the conk will regrow slowly, taking as long as 20 years to reach its original size.

Chaga can be transported easily because of its hard exterior. Store it in a dry environment with adequate airflow. There is no need to refrigerate or dehydrate chaga.

Be sure to check all local regulations before harvesting chaga. For example, on state lands you do not need a permit to collect small amounts of berries, mushrooms or cones from a State Forest, so long as it’s for personal use. If you want to harvest on private land, always get permission from private landowners.

To learn more about chaga, the Minnesota Harvester Handbook has a number of tips for harvesting goods from the woods. It also has a number of helpful facts on each species, organized by season of the year.

Matt Russell, Extension forestry specialist

Share this page:

© 2021 Regents of the University of Minnesota. All rights reserved. The University of Minnesota is an equal opportunity educator and employer.