Upcoming Events

Instructor: Joseph Langlois Fee: $94 (plus HST) per person if you register by the early bird deadline of August 19, 2025. After August 19 the fee is $104 plus HST. What is a gall? If you’ve ever noticed a strange bump, ball, or swelling on a leaf or stem, you’ve likely spotted one—but what caused it? Galls are abnormal plant growths triggered by a diverse range of organisms, including insects, mites, and fungi. Far from being mere deformities, these structures serve as protective homes and food sources for the creatures that create them. They come in an...

A community celebration of trees and the many exciting things happening in the Arboretum lands! Join us for tours of the grounds, trails, gardens, research projects, tree climbing demonstrations, and an in-person plant sale. Take home an interesting woody plant, grown in the Arboretum greenhouse and tended to by our dedicated staff and volunteers. Times: Friday, Sept 5 (evening) and Saturday, Sept 6 (10 AM to 3 PM). The Arboretum Expo will be held on the West Lawn and in The Arboretum Centre, with announcements and performances at the Gazebo...

Instructor: Sean Fox Fee:  $90.00 (plus HST) per person if you register by the early bird deadline of September 3. If you register after September 3 the fee is $100 (plus HST). Note: If we don't have enough registrations by the early bird deadline, the course may be cancelled. Neither great trees nor a carpet of bloom, the often overlooked but ecologically important shrubs and vines in our landscape will be our focus. Fresh specimens and an easy to use key for shrubs will be used. We will be outdoors for half of the day discovering...