Bonus? Butterflies can’t resist them. 2. Cosmos sulphureus ‘Cosmic Orange’ Compact and punchy, ‘Cosmic Orange’ is a powerhouse in containers or along borders. Its bold, almost tangerine ...

The winning entry (pictured above) shows a cross-section of a bloom from the "Cosmic Orange" variety of the Mexican aster (Cosmos sulphureus), with pollen grains maturing inside its anthers.