inset of Stuart Grant on a background image of white pine.
July 07, 2026
Janet McKay
Tags:
As we celebrate 30 years, we’re reflecting on the people who have helped shape LEAF. Stuart Grant has been part of LEAF’s journey since 2007, serving on the Board of Directors through years of growth and change. In this interview, he reflects on what first inspired his commitment, the milestones he’s most proud of and why he remains hopeful about the future of urban forestry.
A group of YUFL participants pose with shovels and planting signs at a City of Toronto tree planting event on a sunny day.
June 23, 2026
Natasha Jovanovic
Imagine walking through your community and recognizing the trees around you as living neighbours — knowing their names, their stories, their significance. For many participants of LEAF’s Young Urban Forest Leaders (YUFL) Program, this is exactly what happens. Through hands-on learning, mentorship and community engagement, youth gain the knowledge and confidence to better understand, care for and connect with the urban forest around them. As LEAF celebrates 30 years of community-driven urban forestry, we are reflecting on the people who are becoming its next generation of stewards.
A mature pagoda dogwood tree, a perfectly sized tree for hesitant landlords or those with small spaces.
June 22, 2026
Amba P
If you’re a renter, you might assume that planting trees around your home is a decision driven entirely by your landlord. But tenants are often the ones who notice where shade would make hot summers more comfortable and where thoughtful landscaping could improve curb appeal. Read on to learn how you can encourage your landlord to plant trees around your home and how LEAF makes it simple.
Wound wood forming around an old pruning cut on a green ash (Fraxinus pennsylvanica) tree
June 01, 2026
Jess Wilkin
When a branch snaps, a tree doesn’t heal the way we do. Instead, it adapts. Read on to learn about the remarkably effective, long-term strategy that trees use to deal with injuries, and why proper pruning can make or break it.
LEAF staff member posing with newly planted tree
May 27, 2026
Adam James
Human activity has been impacting our climate for generations. While it is well known that trees help mitigate climate change by capturing and storing carbon, the question of which trees do this best is rarely discussed. Does species matter? Are native trees better than non-native trees? Let’s investigate!
freeman maple leaf with visible galls
April 29, 2026
Brenna Anstett
Spring is just around the corner, and that means warmer weather, longer days and leafy trees! It’s also the time of year when some people start wondering, “Is there something wrong with my tree?” Of course, the answer to this varies by tree, but here are five common spring tree concerns along with advice on how to tackle challenges.
Threatened mature Elms like this one make up almost 50% in Winnipeg’s public canopy.  
April 15, 2026
Visitor (not verified)
Tags: Urban Forest
Writer, environmental activist and documentary filmmaker Erna Buffie shares the story behind her new book, and how what first felt like a daunting prospect turned into one of the most rewarding experiences of her career. It would prove an incredible opportunity to showcase the extraordinary benefits of urban trees, examine the challenges behind steep urban forest decline, and celebrate the work of Trees Please Winnipeg and other groups across North America fighting to protect their urban trees and forests.
collage of Janet, Dany and a forest canopy
April 01, 2026
Janet McKay
Tags:
As LEAF celebrates its 30th anniversary, we are reflecting both on where we began and where the next generation of environmental leadership might lead. For this first story in our anniversary series, we brought together two voices from different points in our timeline: LEAF founder, Janet McKay, and emerging environmental leader and long-time LEAF program participant, Dany Ko.
collage of tree of heaven, Japanese knotweed and common buckthorn
April 01, 2026
Joel S.
You may be surprised to learn how common some of the most aggressive and impactful invasive plants are – they might even be in your own yard or garden! Species such as tree of heaven, common buckthorn and Japanese knotweed are thriving across Southern Ontario, both in disturbed or neglected spaces and as deliberate plantings from years past. Read on to learn why their spread is concerning, and which native plants can easily replace them on your property.
collage of Spongy Moth, Hemlock Woolly Adelgid and Oak wilt
March 17, 2026
Jess Wilkin
Uh-oh! It looks like your trees may be in for some not-so-friendly visitors this year. We’re highlighting three invasive threats you should watch out for, how they impact trees, the signs and symptoms to spot and what you can do to help manage them.

Pages