Ageratum - A Little History and Some Growing Instructions Ageratum also known as Floss Flower or Whiteweed is an annual that is native to Southeastern North America and Central America with four species native to the United States. Depending on the cultivar, the plants can be erect, spreading or mounding. Flowers can be blue, white or pink and are known to attract butterflies. Ageratum needs well-drained soil and can be grown in partial shade or full sun. In mild climates seed can be sown in the autumn if the soil temperature remains above 50 degrees. In other climates, seed should be sown in the spring when the soil temperature has reached 60 degrees. Sprinkle the seed on the soil and cover with about 1/4 inch of soil.
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