Hammon Buck, owner of Plants Unlimited, will present a free public program Oct. 25 at 7 p.m. in the South Thomaston Historical Society Meeting Room (behind the library) about the use of native plants that help protect the ecosystem of the Weskeag River watershed.

The watershed is 11 square miles in size, with portions located in Thomaston, South Thomaston, Rockland and Owls Head.

Buck will discuss the use of native plants for protection and in rain gardens to improve water quality and help shoreline retention. Native plants are recommended, because most require no pesticides, have few insect problems, are reliably hardy and mix well with existing vegetation.

Buck will also discuss how to plan rain gardens. These gardens, when planted in areas of poor drainage, or drainage that leads to rivers and lakes, helps filter pollutants from the yard and the environment. Further discussion will look at plants to solve shoreline erosion and satisfy shoreline planting requirements.