Visitors downtown will notice several holes in the ground. The holes are left from trees that were previously in planters along the sidewalks flanking Main Street.Urban Forestry, a division under McMinnville Public Works Department director Bill Brock, discovered a small problem with the shallow root systems of several trees at the beginning of the year.Maple trees, as well as other types of trees, were planted in beds along Main Street. The beds are inside concrete curbs that stick up along the sidewalk.