One of the "Human+Nature" sculptures at Morton Arboretum. (Courtesy of Morton Arboretum)

Along with the kick off to beach season, a number of other outdoor attractions are opening up in Chicago over Memorial Day weekend.

The biggest change between the 2010 tree census and 2020's was the loss of 6 million ash trees. (Patty Wetli / WTTW News)

Between 2010 and 2020, Chicago’s canopy cover decreased from 19% to 16%, largely due to the loss of mature ash trees, according to the 2020 tree census spearheaded by the Morton Arboretum. 

Mid-to-late May is the safest bet for most planting in Chicago. (Lukas / Pexels)

It’s easy to forget the cruelest April Fool’s joke: The season’s last frost is likely several weeks away, meaning it’s far too early to put most plants in the ground.

Cook County Forest Preserve stewardship days have looked different during the coronavirus pandemic. (Forest Preserve District of Cook County / Facebook)

Green spaces have seen unprecedented use during the pandemic, which has left land stewards overwhelmed by crowds, but heartened to see so many new visitors.

(Mabel Amber / Pixabay)

OAKtober Campaign Aims to Raise Awareness, Spur Action

Oak was once the predominant tree in the Chicago area. Now most of them are gone. Ecologists have a plan to make sure they don’t disappear from the region entirely, and they need our help.

What triggers the internal prompt that tells a tree "Oh hey, winter's coming"? It's a mystery to researchers. (Patty Wetli / WTTW News)

There’s still a lot that scientists don’t understand about what makes trees tick, especially when it comes to fall color. A team at the Morton Arboretum is working to unlock those secrets.

A census of the Chicago region's trees, last tallied at 157 million in 2010, is in progress. (Brian Crawford / Flickr)

The 2020 census of the region’s trees — the largest undertaking of its kind in the country — will build on the inaugural 2010 count and help municipalities set priorities for creating healthier green infrastructure, particularly in underserved communities.

Neighbors in Ravenswood Manor are raising funds to save the area’s parkway ash trees. (Patty Wetli / WTTW News)

The city has given up on its ash trees, but some Chicagoans refuse to let theirs die.

The new exhibition “Nature Connects” adds colorful creatures to the arboretum’s grounds using more than half a million Lego bricks.

We take you on a visit to the west suburban forest under the watchful eye of six suspicious – and sizable – trolls.

A group of residents is getting back to its roots—literally—by partnering with the Morton Arboretum to harness the positive impact of trees on everything from the crime rate to the business community.

The mayor announced Thursday the city's Bureau of Forestry would plant 3,000 new trees this year. (Streets and Sanitation Department)

Amid public outcry over police oversight, rising crime and uncertainty surrounding the cash-strapped Chicago Public Schools, Mayor Rahm Emanuel had some good news for city residents on Thursday.

Less than half of the plant life found in the Chicago region is native to the area. As the Morton Arboretum's tree improvement specialist, it's Joe Rothleutner's job to make sure those native plants are protected.

One in five parkway trees in Chicago is threatened by the Emerald Ash Borer beetle. So what can people do to stop the shrinking of the region's tree canopy? The Morton Arboretum's CEO, Gerry Donnelly, joins us to talk about reversing tree loss.

“Seeing Trees in a Different Light”

An illuminating spectacle brightens wintry nights at the Morton Arboretum.

The emerald ash borer is devastating ash trees in the area. We meet some researchers who are trying to understand the tiny green bug well enough to find an ash tree that can co-exist with this pervasive pest.