Must Grow New Perennials for 2012 'Warm Summer' Coneflower - Enjoy a bounty of multihue blooms from this flowering coneflower. 'Warm Summer' blooms the first year planted from seed. Enjoy single-petal flowers in warm summer shades (think gorgeous sunsets) of orange, yellow, red, rose, purple, and cream. 'Warm Summer' produces flowers for bouquets from June through August. It fills a garden bed with warm color -- just sow seeds and enjoy flowers later in the season.