Ageratum blooms from midsummer until first frost. Floss Flower is extremely versatile, and it is ideal for bedding displays or as a potted plant. The size and color makes this Ageratum a good candidate for rock gardens, flower beds, and containers. Ageratum Houstonianum likes to grow in full sun or partial shade and prefers moist, but well-drained soil. Ageratum is an excellent plant for beginner gardeners.