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1927 Map of the Arboretum

Tree Mobs™

Peter Del Tredici, (center) Senior Research Scientist; Lecturer in Landscape Architecture leads a tree mob exploring different varieties of Stewartia at the Arnold Arboretum.
Peter Del Tredici (center), the Arnold Arboretum's senior research scientist, discusses the Stewartia collection, which dates from 1918. “You can come here and see these plants, but you don’t know anything about them. You could hold your cell phone up [to the bar codes on the signs posted by many plants]. But it’s better to have someone tell you,” said Del Tredici.

Upcoming Tree Mobs are listed on the Events page and you can sign up here to receive email notifications.

What’s a Tree Mob™?

Tree Mobs are short, spontaneous learning opportunities inspired by ephemeral plant phenomena in the landscape. Did the magnolias just start blooming? Are the witch-hazels dispersing their seeds? Take a deep dive into one of these plants with Arboretum experts, at a time when they are at their most beautiful and noticeable within the landscape.

What can I expect?

Plan to spend approximately 30 minutes learning about an interesting component of our collection. You can then continue your exploration of the Arnold Arboretum on your own. Tree Mobs are time, date, and location specific.

How does it work?

Tree Mobs are scheduled about a week beforehand, so we can make sure the tree is still looking its best on the day of. We will communicate about upcoming tree mobs by posting them as an event on our website’s events page and emailing the Tree Mobs mailing list. But if you don’t get a spot in the on-site Tree Mob, don’t worry: most Tree Mobs are offered both on-site and virtually, and virtual spots are unlimited.

See a list of past Tree Mobs.