Answer: Ageratum, or Flossflower, should bloom June through frost so it sounds like a good choice for your garden plot. Keep the spent flowers cut off, and feed monthly during the growing season for best performance. Chrysanthemums may out-flower the Ageratums, but both should be in bloom at the same time for several months. A second suggestion might be African Daisy (Dimorphotheca), sometimes called Cape marigold. The plants grow about 12" high with flowerheads 1 1/2 " across, in lavender-blue with yellow centers. These plants grow best in full sunshine, in slightly dry soils.
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