The city’s third annual set of formal Arbor Week celebrations runs for five days next week, focused on activities and information promoting the city’s urban forest, including the introduction Monday of the Cambridge Trees Geocache Series.

April 22: Poems about trees will be displayed in various neighborhoods and a geocache scavenger hunt challenges people to explore and discover favorite places chosen by city arborist Dave Lefcourt. Information and the app are at geocaching.com/play.

April 23: Lefcourt plans to table outside City Hall, 795 Massachusetts Ave., Central Square, from 10 a.m. to noon to hand out free seedlings and other materials, as well as talk with residents about the role trees play in the city.

April 24: Lefcourt plans to host a tree planting at 9 a.m. at the Kennedy-Longfellow School, 158 Spring St., East Cambridge and lead a Tree Walk through Mid-Cambridge at 6 p.m., starting in front of the Cambridge Main Library, 449 Broadway. Free bare root seedling trees will be available.

April 25: From 10 a.m. to noon, weather permitting, members of the community are invited to the Cambridge Main Library to collect information about trees, get a free seedling and partake in an Arbor Day scavenger hunt for children. Librarians plan to read a tree-themed book to children outside the library at 11 a.m.

April 26: The week wraps up with two Arbor Day tree plantings, including one at 9 a.m. of 25 to 30 trees in Danehy Park, 99 Sherman St., in Neighborhood 9 just east of Fresh Pond, with the help of students from Cambridge Rindge and Latin School. A commemorative 9:15 a.m. planting of a tree is also planned at the Graham & Parks School, 44 Linnaean St., Neighborhood 9, with Mayor Marc McGovern and City Manager Louis A. DePasquale attending.

“We’re excited to add some new events to celebrate Arbor Week this year, encouraging residents of all ages to take a moment to look around and learn more about the spectacular trees we have here in Cambridge,” Public Works Commissioner Owen O’Riordan.

The city program lets residents search for a street tree near the address of their choice (a home, business, school, etc.) and commit to keeping it healthy by watering it and tending to it. The program is at CambridgeMA.gov/AdoptATree.

This post was updated April 18, 2019, to reflect the city changing the location of an April 26 tree planting to Danehy Park.