When Gerald and Mary Edith Moore take even a casual walk around the trails at Petaluma's popular Shollenberger Park and the adjacent Ellis Creek wetlands, they see work to do.
"Gerald, we've got to get rid of that invasive plant," Mary Edith Moore said on Thursday afternoon, pointing to a tuft of pampas grass growing by the edge of a trail.
She was recovering from having two small cysts removed from her eyelid, so her husband replied, "When you get your stitches removed, we'll come and wrestle that out."
It's the only pampas grass left in the area, part of a campaign that the couple, in their 70s, have led to remove unwanted species at Shollenberger Park and replace them with native ones.
The Moores estimate that they each spend 25 to 40 hours a week in their efforts at the wetlands. That includes everything from wading into the water to pull out weeds to stocking brochure racks to teaching new docents how to lead educational walks.