A SPRIG is a small branch or shoot of a plant, often used for decoration. In this case, the SPRIG is a bit of mistletoe or holly, two plants that are commonly used as decorations during the winter holidays. Mistletoe is a parasitic plant that grows on trees and has white berries, while holly is an evergreen shrub with glossy leaves and red berries. Both plants are often hung in doorways or over windows during the holiday season.