Echinacea purpurea. Purple Coneflowers Echinacea seeds produce plants that are long-blooming from July to October. At home as a border feature or in the vegetable garden. Bright mauve-pink petals surrounding a distinctive rich plum center cone. Sow 5mm (¼”) deep. May bloom in the first year if planted in early March, but it’s their third year that is really spectacular. These perennial coneflowers attract hoverflies and parasitoid wasps, so they’re useful for pest control in companion plantings. Echinacea plants are sturdy and drought tolerant once established, so they are useful in xeriscaping. Plant height to 80cm (32″).