He was named after his great-grandfather Geoffrey II , Count of Gâtinais Geoffrey received his nickname from the yellow sprig of broom blossom ( genêt is the French name for the planta genista , or broom shrub ) he wore in his hat .
He received his nickname , Plantagenet , from the yellow sprig of broom blossom ( genêt is the French name for the planta genista , or broom shrub ) he wore in his hat .