Seeds from Antirrhinum majus maximum Ruby. This annual is a favorite flower in gardens of North America because it easily establishes from seeds, and it gives an eye popping display of colorful blooms. Growing 30 inches tall in full sun, space this tall variety 12 to 18 inches apart. After finished blooming, trim the plants back, and they will quickly be blooming again. They perform best in cooler summer climates. In hot regions, provide the plants with some afternoon shade.