(Ageratum houstonianum) Annual. Extra abundant producer of blooms! Miniature daisies in clusters, with petals so fine they look like glistening silk thread, giving them their common name of Floss Flower. Each bloom is bi-colored a soft lavender-blue to white. The soothing tones make an ideal foil for warmer colors in summer ornamental beds. Blooms all summer long, height to 8”.