Ageratum Houstonianum. The Blue Floss Flower. The Ageratum houstonianum or Floss Flower as it is more commonly known, belongs to the Asteraceae family - the same very special family to which the Daisies, Asters, Gerberas, Chrysanthemums and so many others all belong. It is a Native plant of Mexico. There are many types of Ageratum, but Ageratum houstonianum is the most commonly used in both home and display gardens of all kinds.
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Previous Next An old favorite with its fluffy round clusters, Ageratum houstonianum Floss Flower is one of the few annuals to tolerate light shade. Its colors range from blue, purple, lavender to pink, red, white and bicolor, providing a nice contrast with the rest of the bedding plants. Easy to grow, Ageratum houstonianum performs best in full sun in rich soils with good drainage and consistent moisture during the growing season. Avoid overhead watering and provide good air circulation to prevent the plant from powdery mildew.
Light shade is tolerated in hot summer areas. Excellent choice for beds, borders, edgings, mass planting, rock gardens or groundcovers. Perfectly suited to mixed containers too. Excellent as cut flowers on the taller varieties. Easily grown from seed, starting indoors in late winter and transplanting outdoors after the danger of frost has passed. Alternatively, seeds can be sown in the garden after the last frost date.
If you prefer live plants, they are available from many nurseries. Deadhead spent flowers to keep the plant tidy and promote profuse blooming. In warm climates, Ageratum may self-sow.
Very popular series. Up to 1 foot tall. Up to 2. Compact and reliable garden performer. Very free flowering. Compact and showy.
Use in combinations, window boxes and landscaping Maintenance Notes: Deadheading not necessary for continuous bloom. Plants will "bury their dead" new flowers will quickly cover old flowers so no deadheading necessary. Most other Ageratum will need deadheading. Unlike most Ageratum the Artist series will bloom through the summer in hot climates.
Garden locations Culture Annual. Easily grown in average, moist, well-drained soils in full sun. Prefers rich soils with good drainage and consistent moisture throughout the growing season. Plants tend to wilt quickly if soils are allowed to dry out. Tolerates light shade, and prefers some light afternoon shade in hot summer climates. In climates where powdery mildew is a problem, avoid overhead watering and site in areas with good air circulation. Ageratums are easily grown from seed.