Ageratum houstonianum- Floss flower -Frost tender annual of the aster family. Characterized by flowerheads in which the ray flowers are tubular, creating a fine feathery effect. Blooms June to frost -Full sun to part shade. Requires moist soil that never becomes dry.
Here is another planting that features a couple of the same annuals, but in linear bands instead of blocks. You can see the fuzzy pink plumes of fountain grass, Brazilian verbena, floss flower (Ageratum houstonianum ‘Blue Horizon’), Euphorbia ‘Diamond Frost’ and Alyssum lobularia (Sweet alyssum).