The preschool kids from Buckland-Shelburne Elementary School came to the Bridge of Flowers yesterday morning to drop off the 21 dahlia tubers they planted and have been tending for the past weeks. Head Gardener Carol DeLorenzo and I greeted them and thanked them for their patient work in caring for  the 'China Doll' dahlias that will bloom in all the shades of the sunset later in the season. Everyone loves dahlia season. After several days of excitement in…