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Ageratum houstonianum (Floss Flower)

Ageratum, Floss Flower, Bluemink, Blueweed, Pussy Foot, Mexican Paintbrush

Ageratum houstonianum, Floss Flower, Ageratum Blue Horizon, Ageratum Blue Danube, Ageratum, Floss Flower,  Bluemink, Blueweed, Pussy Foot, Mexican Paintbrush, Blue Annual Flowers, Blue Summer Flowers
Ageratum houstonianum, Floss Flower, Ageratum Blue Horizon, Ageratum Blue Danube, Ageratum, Floss Flower,  Bluemink, Blueweed, Pussy Foot, Mexican Paintbrush, Blue Annual Flowers, Blue Summer Flowers
Ageratum houstonianum, Floss Flower, Ageratum Blue Horizon, Ageratum Blue Danube, Ageratum, Floss Flower,  Bluemink, Blueweed, Pussy Foot, Mexican Paintbrush, Blue Annual Flowers, Blue Summer Flowers

An old favorite with its fluffy round clusters, Ageratum houstonianum (Floss Flower) is one of the few annuals to tolerate light shade. A nonstop bloomer from mid-summer to fall (Ageratum means ‘long-lived’ in Greek), it grows easily in shapely mounds ranging from 6-24 in. tall (15-60 cm) and mixes extraordinarily well with all other annuals and perennials. Its colors range from blue, purple, and 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. Don’t let it dry out! 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).
  • Butterflies, bees, and other pollinators and beneficial insects are drawn to the flowers, making them a useful addition to the vegetable garden.
  • No serious pest or disease issues. It is deer and rabbit resistant.
  • 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.
  • The main cultivars are:
    Hawaii’ Series flowers in shades of blue, white, or pink. Very popular series.
    Bavaria’ has white flowers with bright turquoise borders. Up to 1 foot tall.
    Red Top’ has very striking bright magenta flowers on 3-inch heads. Up to 2.5 feet tall.
    Blue Danube‘ is a classic hybrid with purple-blue flowers in dense heads. Compact and reliable garden performer. Very free flowering.
    Blue Horizon‘ is one of the tallest (up to 18-30 in. or 45-90 cm) with lavender to purplish-blue flowers resembling asters. Great as cut flowers
    Pinky Improved’ has showy flowers that are dark pink in the centers, fading to pale pink at their fringed edges. Compact and showy.
    Southern Cross’ has bicolor flowers that are white in the center, gradually turning to cornflower blue near the edge. Compact and showy.

 

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Want to learn how to grow and care for angelonia like a pro? Follow these simple steps and enjoy the beauty of these striking plants

Requirements

Hardiness 2 - 11
Heat Zones 1 - 11
Climate Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Compositae
Genus Ageratum
Common names Floss Flower
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid, Late)
Fall
Height 6" - 2'
(15cm - 60cm)
Spread 6" - 1'
(15cm - 30cm)
Spacing 6" - 12"
(15cm - 30cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Tolerance Deer, Rabbit
Attracts Bees, Butterflies
Garden Uses Beds And Borders, Edging, Ground Covers, Patio And Containers
Garden Styles Gravel and Rock Garden, Informal and Cottage, City and Courtyard
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Ageratum (Floss Flower)
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Alternative Plants to Consider

Ageratum houstonianum ‘Blue Mink’ (Floss Flower)
Ageratum houstonianum ‘Dondo White’ (Floss Flower)
Ageratum houstonianum ‘Red Bouquet’ (Floss Flower)
Ageratum houstonianum ‘White Bouquet’ (Floss Flower)
Ageratum houstonianum ‘Blue Horizon’ (Floss Flower)

Recommended Companion Plants

Dahlia ‘Mrs Eileen’
Antirrhinum majus (Snapdragon)
Agastache ‘Blue Fortune’ (Giant Hyssop)
Stipa tenuissima (Mexican Feather Grass)
Rudbeckia hirta ‘Prairie Sun’ (Black-Eyed Susan)

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Ageratum (Floss Flower)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 2 - 11
Heat Zones 1 - 11
Climate Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Compositae
Genus Ageratum
Common names Floss Flower
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid, Late)
Fall
Height 6" - 2'
(15cm - 60cm)
Spread 6" - 1'
(15cm - 30cm)
Spacing 6" - 12"
(15cm - 30cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Tolerance Deer, Rabbit
Attracts Bees, Butterflies
Garden Uses Beds And Borders, Edging, Ground Covers, Patio And Containers
Garden Styles Gravel and Rock Garden, Informal and Cottage, City and Courtyard
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Ageratum (Floss Flower)
Not sure which Ageratum (Floss Flower) to pick?
Compare Now

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