Greg Dorr of Lone Pine Tree Care at the Wakefield Estate. (Photo: Lone Pine Tree Care)

A free program on “Care and costs to keep my trees healthy” is set for 7 p.m. Wednesday in Room 3-097 of Lesley’s University Hall, 1815 Massachusetts Ave., Porter Square, from the group Cambridge4Trees.

The program aims to help Cambridge tree owners take the best care of their trees as summer approaches, said Cambridge4Trees, crediting a seminar by the group Trees for Watertown as inspiration.

Part of Wednesday’s event is to be “Tree Care 101: Stewarding Your Part of the Urban Forest” with Lone Pine Tree Care’s Gregory Dorr, a certified master arborist. He will explain what urban forestry is; help us understand the difference between the jobs of tree wardens and private maintenance of trees; explain the importance of proactive tree care; and give an overview of the basics of pruning. A quick summary of tree risk assessment will round out his talk.

A representative of Boston Tree Preservation will talk about “compost tea,” including how it’s made and is used (and might reveal the city’s “secret sauce” recipe).

Charles Teague, president of Cambridge4Trees, will explain tree ordinances specific to Cambridge and share an overview of the status of the city’s Urban Forest Master Plan and why it’s important to advocate for more funding during a public hearing on trees planned for 3 p.m. April 25.

There will be “mulch” more, Teague said.

For virtual Zoom meeting info, email [email protected].