The Crocosmia George Davidson, 'Crocosmia x crocosmiiflora george davidson', a spring planted corm, produces beautiful yellow flowers. The flowers are very showy, and they make great cut flowers. The Crocosmia is also commonly known as Monbretia. Crocosmias are clump forming and bloom best in crowded conditions. This plant has attractive foliage. Hummingbirds flock to their blooms.