CAPE ELIZABETH — Volunteers will be preparing the site of the first planting of the Arboretum at Fort Williams Park on Saturday.

The volunteer workday marks the official start of the project, which ultimately envisions 15 planting sites around the 90-acre park.

The morning will begin with a ribbon-cutting ceremony at 9 a.m. Volunteers will then work on a site along the Cliff Walk that is overgrown with exotic invasive plants. The removal of these plants will clear the way for planting later.

Volunteers are asked to bring gloves as well as pruning saws and loppers. Organizers say this phase of the project is not suitable for participation by children.

More information about the project is available at www.arboretumatfortwilliams.org