Ageratum houstonianum height

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Used for edging or low massing plant in bed. The plant’s leaves and stems are often covered in fine hairs, contributing to its overall soft texture. Overwatering can lead to root rot, while underwatering may cause wilting and reduced flowering.

Pruning

Pinch back young plants when they reach about 10 cm (4 inches) tall to encourage bushier growth.

He founded GardeningStepbyStep.com in 2012. Remove affected leaves and avoid overhead watering. Provide more sunlight and proper spacing between plants.

  • Poor flowering: Often due to excessive nitrogen. Horticultural varieties are mainly circulating. Although flowers bloom for a long time, it is necessary to pinch the flower shells and dead leaves frequently.

    The stem stands upright, the leaves are green and round, attached to the stem.

    Ageratum is particularly well-suited for borders, edging, and container gardens, where its compact growth habit and prolific blooms can be fully appreciated.

    Ageratum pairs beautifully with other summer annuals such as marigolds, zinnias, and petunias, creating a vibrant and colourful display.

    All parts of the plant can cause gastrointestinal upset if consumed.

    • Care requirements

    RequirementDetails
    Light requirementsFull sun to partial shade
    Water and humidity requirementsModerate water needs; keep soil consistently moist but not waterlogged
    Temperature requirementsPrefers 18-24°C (65-75°F); hardy in USDA zones 10-11, UK zones H1C-H2
    Soil requirementsWell-draining, fertile soil with pH 6.0-7.0
    Feeding requirementsMonthly application of balanced, water-soluble fertiliser during growing season
    PropagationMainly by seeds, also possible through stem cuttings
    PruningLight pinching to encourage bushiness; deadhead spent blooms to promote continued flowering

    Best Cultivars

    1. ‘Blue Horizon’: Tall variety reaching 60-75 cm, with lavender-blue flowers; excellent for cutting.
    2. ‘Hawaii White’: Compact plant with pure white flowers, growing to 15-20 cm tall.
    3. ‘Blue Danube’: Medium-height variety (30-40 cm) with intense blue flowers.
    4. ‘Red Sea’: Unusual reddish-pink flowers on plants 15-20 cm tall.
    5. ‘Dondo White’: Large, pure white flowers on compact plants, 15-20 cm tall.
    6. ‘Artist Purple’: Deep purple flowers on mounding plants, 20-25 cm tall.
    7. ‘Aloha Blue’: Sky blue flowers on compact plants, 15-20 cm tall.
    8. ‘Tango’: Mix of pink, white, and blue flowers on plants 20-25 cm tall.

    How to grow Ageratum

    Soil and Feeding

    Ageratum thrives in well-draining, fertile soil.

    Improve drainage and reduce watering frequency.

  • Leaf spots: Brown or black spots on leaves.

    If plants become leggy, trim them back by about one-third to rejuvenate growth. Avoid over-fertilising, as this can lead to excessive foliage growth at the expense of flowers.

    Watering

    Maintain consistently moist soil, but avoid waterlogging.

    Flower color is predominantly blue-violet, but there are white and peach colored ones. Its ability to thrive in both full sun and partial shade makes it a versatile choice for various garden settings. Dependable flowering annual.

    ageratum houstonianum height

    Reduce fertiliser and ensure plants receive enough sunlight.

  • Frost damage: Blackened leaves and stems. Remove with a strong spray of water or use insecticidal soap.
  • Root rot: Wilting despite moist soil, often due to overwatering. Apply fungicide if severe.
  • Aphids: Tiny insects clustered on new growth.

    The genus name "Ageratum" is "a" (negative prefix) + "geras" (stale) = not old (not old).

    Ageratum houstonianum

    Ageratum houstonianum

    • Location: Farm Tomita

    • Location: Farm Tomita

    • Location: Kojimachi

    • Location: Yufuin

    • Location: Farm Tomita

    • Location: Farm Tomita

    • Flower name

      Ageratum houstonianum

    • Scientific name

      Ageratum houstonianum

    • Aliasオオカッコウアザミ, 大霍香薊, ムラサキカッコウアザミ, Ageratum, Floss flower
    • Place of originLatin America, such as Mexico and Peru
    • Place of floweringGarden, Cut flowers, flower arrangement, Park, Potted flower
    • Flowering seasonJune, July, August, September, October
    • Language of flowersAetna

    What is Ageratum houstonianum

    Birth flowers for Oct 29

    Ageratum houstonianum or flossflower (Scientific name: Ageratum houstonianum) is native to Latin America, such as Mexico and Peru, is a non-cold-resistant annual grass of the family Asteraceae.

    Regularly deadhead spent blooms to promote continuous flowering and prevent self-seeding. Ageratum is somewhat drought-tolerant once established but performs best with regular watering. Water deeply when the top inch of soil feels dry.