LEAF is a non-profit organization dedicated to the protection and enhancement of our urban forest. We offer programs to help you plant, care and give.

Joined October 2008
3,609 Photos and videos
Jun 12
🌿 Stewardship starts with community! Thank you to everyone who joined us at Stewart Burnett Park in Aurora to care for native trees & shrubs and remove invasive species. Your efforts help this naturalization site thrive and support a healthier #UrbanForest for years to come
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Jun 12
Looking to get involved? check out upcoming events: zurl.co/8yRpj   Thanks to @CdnTreesforLife & @Town_of_Aurora!

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Jun 12
A heartfelt thank you to all who joined us at North Maple Regional Park to celebrate 30 years of LEAF stewardship! 🌳 Together, you helped remove invasive species and care for native trees & shrubs, supporting a healthier and more resilient #UrbanForest 🌿
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Jun 12
Looking to join? check out upcoming events: zurl.co/PSSLO Thanks to @CdnTreesforLife & @City_of_Vaughan for your support!

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Jun 12
🌳 Ever wondered, “What kind of tree is that?” My First Ontario Tree Book by Jeffrey C. Domm is an illustrated guide to identifying Ontario’s 40 most common trees and building a deeper connection with the #UrbanForest.
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Jun 12
GIVEAWAY 🎉 We're giving away one copy of My First Ontario Tree Book, plus a copy of Edible Ontario Mushrooms. To enter, comment with your favourite Ontario tree species (or a tree that means something special to you).
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Jun 12
Winner will be selected at random. Contest closes June 17, 2026. Open to and shipping within Canada only.
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Jun 11
📣LAST CALL! Join LEAF’s guided tree tour at North Maple Regional Park in Vaughan on Sat, June 13 from 9:30 - 11AM to explore biodiversity, local ecosystems, and how to identify different tree species. Sign up: zurl.co/uqrFh. Supported by @City_of_Vaughan .
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Jun 11
🌳 If a tree is injured, it cannot heal itself like we do. So how does it survive? When you scrape your knee, your body repairs the damage by forming a scab, fighting infection, and growing new skin. Trees take a very different approach.
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Jun 11
🌳 Once wood is damaged, it stays damaged. Instead of healing, trees limit the internal spread of decay after injury by building barriers within the wood that compartmentalize the damaged area. This remarkable process helps trees survive injuries for decades.
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Jun 11
✂️ This is also why proper pruning matters. Where and how a cut is made can either support a tree's natural defences or make it harder for the tree to protect itself. Read more about how trees respond to injury and why pruning matters: yourleaf.org/node/2827

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Jun 10
🌳 Meet the Kentucky coffeetree, one of the last native trees to leaf out in spring. It has a bold canopy, large divided leaves, distinctive seed pods and a striking winter silhouette. It handles drought, clay soils and road salt. Plant one today: zurl.co/hlHaP
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Jun 9
🌳💧 Want to help your trees and shrubs grow stronger and more resilient over time? Young trees need 6 gallons of water twice a week, while young shrubs need 4 gallons. Slow and deep watering reaches the roots where it is needed most. Learn more: zurl.co/bKZFL
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LEAF retweeted
Markham residents can take advantage of the Do-It-Yourself Tree Planting option through our partner, @leaf, featuring a virtual consultation with a certified arborist, instructional videos, premium mulch, a care guide, and home delivery. This program is designed to make greening your property easy and affordable. Learn more: markham.ca/Leaf
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Jun 8
🌳Nominations are now open for the 2026 Ontario Tree of the Year! @treetrusttrees is inviting the public to celebrate their favourite trees, from backyard oaks to riverside willows, by sharing a photo and a short story about what makes them special.
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Jun 5
🌱 Soil plays a critical role in the health of urban trees and shrubs, but it is often overlooked when planning what to plant. Made up of minerals, air, water and organic matter, it varies widely from yard to yard.
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Jun 5
Texture, moisture and organic content all affect how well trees and shrubs grow, and urban soils are often compacted or low in organic matter due to construction.  Learn more about why soil matters and how to improve growing conditions: zurl.co/rHzUG

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Jun 4
Backyards play an important role in supporting local biodiversity. 🐦🦋 Native trees and shrubs provide food, shelter and habitat for birds, pollinators and other wildlife in urban and suburban spaces.
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Jun 4
Ex: a single oak tree can support over 500 species of insects, birds & other wildlife. Many native trees, including willows, cherries & maples, also support local ecosystems. Even one planting can help strengthen backyard biodiversity.
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Jun 4
#BackyardBiodiversity is an educational campaign in partnership with @TWC_Wildlife. Learn more: zurl.co/RtXZZ.

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