ARLINGTON — It isn’t just Arbor Day here. In Arlington, April is Arbor Month.

A free workshop tonight is offered to people who want to know more about the social, physiological, psychological and cultural importance of trees.

The workshop is from 6 to 8 p.m. in Arlington’s utilities office building, 154 W. Cox Ave., near Haller Park. It is sponsored by the Stillaguamish Tribe, the WSU Extension Forest Stewardship Program, the city, Sound Salmon Solutions, Pilchuck Audubon Society, the Arlington Arts Council, the National Forest Service and the state Department of Natural Resources.

The idea is that people in Arlington need to plan ahead so that future generations have the chance to form memories of stately boulevards lined with trees and of summers resting under the majestic trees in a city park, said city recreation director Sara Lopez.

Arbor Month also is to include opportunities for volunteers to plant trees and learn more about them.

At tonight’s workshop, participants will get to make and take home their own tree oil, made from an old recipe using elements of a blend of native trees.

Arlington’s volunteer Tree Tenders group has selected Jensen Park for its pilot project in urban forest planting.

They picked the park, at 7801 Jensen Farm Lane near Cascade Valley Hospital, because the lawn there can easily be converted to forest. More volunteers are needed to join Tree Tenders, Lopez said. Later the group will be asked to help the city design the forestry component of the city’s comprehensive plan.

Arlington’s annual Arbor and Earth Day Celebration is scheduled from 9:30 a.m. to 2 p.m. Saturday at Jensen Park. Pilchuck Audubon Society plans to lead backyard birding class at the park and a bird walk at the nearby Portage Creek Wildlife Sanctuary. The Stillaguamish Tribe plans to offer arts activities and storytelling as well as oversee the planting of native species donated by its nursery, Banksavers. Arlington students plan to demonstrate experiments. Volunteers will be sought that day for a creek clean-up and blackberry removal session.

More information about Arlington’s trees activities is available by contacting Andrew Noone at andrew@soundsalmonsolutions.org or 452-252-6686.

Gale Fiege: 425-339-3427; gfiege@heraldnet.com.