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LEAF @leaf

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
  • Tweets 13,509
  • Following 907
  • Followers 11,712
3,609 Photos and videos
LEAF@leaf
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
photo collage of participants posing at a LEAF stewardship event

ALT photo collage of participants posing at a LEAF stewardship event

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LEAF@leaf
Jun 12
Looking to get involved? check out upcoming events: zurl.co/8yRpj   Thanks to @CdnTreesforLife & @Town_of_Aurora!
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LEAF@leaf
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 🌿
photo collage of participants posing at a LEAF stewardship event

ALT photo collage of participants posing at a LEAF stewardship event

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LEAF@leaf
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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LEAF@leaf
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.
Toronto trees and edible mushroom guidebook front covers, alongside information to enter the giveaway draw

ALT Toronto trees and edible mushroom guidebook front covers, alongside information to enter the giveaway draw

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LEAF@leaf
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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LEAF@leaf
Jun 12
Winner will be selected at random. Contest closes June 17, 2026. Open to and shipping within Canada only.
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LEAF@leaf
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 .
LEAF staff member leading a tree tour

ALT LEAF staff member leading a tree tour

Vaughan tree tour event details

ALT Vaughan tree tour event details
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LEAF@leaf
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.
a mature oak tree with visible wound wood around a previous pruning cut

ALT a mature oak tree with visible wound wood around a previous pruning cut

close up of branch pruning in action

ALT close up of branch pruning in action

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LEAF@leaf
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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LEAF@leaf
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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LEAF@leaf
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
collage of kentucky coffeetree showing form, leaves, seeds and bark

ALT collage of kentucky coffeetree showing form, leaves, seeds and bark
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LEAF@leaf
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
LEAF staff watering newly planted trees

ALT LEAF staff watering newly planted trees

LEAF staff watering newly planted trees

ALT LEAF staff watering newly planted trees

LEAF staff watering newly planted trees

ALT LEAF staff watering newly planted trees
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LEAF retweeted
City of Markham
@cityofmarkham
Jun 8
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
Person kneeling outdoors planting a young tree with soil around its roots during a sunny day.

ALT Person kneeling outdoors planting a young tree with soil around its roots during a sunny day.
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LEAF@leaf
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.
Ontario Tree Pageant 2026 contest announcement with pageant logo and submission details

ALT Ontario Tree Pageant 2026 contest announcement with pageant logo and submission details

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LEAF@leaf
Jun 8
Help highlight the beauty and value of Ontario’s legacy trees and the many benefits they provide to our communities. 🌿 Learn more: zurl.co/dLM3s

Ontario Tree Pageant -

Do you have a majestic oak standing proudly in your front yard? A towering willow that has watched generations grow? Or a beloved tree in your favourite local park that holds unforgettable memories?...

treetrust.ca
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LEAF@leaf
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.
hands holding soil

ALT hands holding soil

maple seedlings growing in mossy soil

ALT maple seedlings growing in mossy soil

brown compacted soil

ALT brown compacted soil

hands applying mulch donut to newly planted tree

ALT hands applying mulch donut to newly planted tree

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LEAF@leaf
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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LEAF@leaf
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.
scarlet tanager

ALT scarlet tanager

eastern tiger swallowtail

ALT eastern tiger swallowtail

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LEAF@leaf
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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LEAF@leaf
Jun 4
#BackyardBiodiversity is an educational campaign in partnership with @TWC_Wildlife. Learn more: zurl.co/RtXZZ.
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