Crocosmia George Davidson - Montbretia. Spice up your summer garden with this stunning flowering plant. At the time that other plants are slowly losing their summer glory, Crocosmia is a real show stopper. Crocosmia, also known under the name Montbretia, is a spectacular flowering plant native to South Africa. Plant Crocosmia bulbs in the garden or in pots and containers, in humus-rich, well-drained soil in full sun.