The Santa Rosa City Council on Tuesday banned the use of synthetic weed-killers like Roundup at dozens of parks, buildings and medians around town.

The decision came on a unanimous vote — with Mayor Chris Coursey absent and barely any audience in the council chambers — to approve a one-year extension of the contract with a company that has provided city landscape maintenance services since 2014.

But it culminated a citizen campaign, initiated three years ago, to eliminate use of synthetic herbicides on city property.

The company, Golden Gate Landscape Management, has sprayed glyphosate-based weed killer on parks and other public property under its $509,000 annual contract. The council renewed the contract, but added a prohibition on glyphosate.

Officials told the council that use of products containing glyphosate had already been abandoned, and council members Jack Tibbetts and Julie Combs expressed thanks for their action.

“I think it’s fantastic,” said Anne Seeley, a Santa Rosa area resident and Sonoma County Conservation Action board member.