Kiera Jasper of Farmington uses a garden trowel Thursday to break apart roots of a yarrow, a medicinal herb that can become invasive, at the University of Maine at Farmington Community Garden on South Street in Farmington. Jasper is an incoming senior at UMF. Donna M. Perry/Sun Journal

Kiera Jasper of Farmington, an incoming senior at the University of Maine at Farmington, tries Thursday to pull out yarrow, a medicinal herb that can become invasive, at the UMF Community Garden on South Street in Farmington. She is studying math but she likes plants. There is a lot of math in planting, she said. Donna M. Perry/Sun Journal

Kiera Jasper of Farmington holds a yarrow she pulled Thursday from the University of Maine at Farmington Community Garden in Farmington. The medicinal herb was becoming invasive so the incoming UMF senior thinned it from the raised bed. Donna M. Perry/Sun Journal