Minnesota is home to the largest population of black ash in the United States. Coming in with 792 million black ash we have plenty to be concerned with when it comes to the state's ash population and Emerald Ash Borer. The black ash can be found in the moist areas naturally but has adapted well to the urban environment. This species of ash is under considerable threat rom the Emerald Ash Borer as it is not resistant. It is not recommended to plant any ash trees in Minnesota.