Ageratum houstonianum, commonly called floss flower, is a frost-tender annual of the aster family that provides continuous bloom for beds, gardens or. A. houstonianum is an annual herb native to Mexico and Central America. It was brought to Europe shortly after its discovery, where its use as. There are many cultivars available of this fast-growing annual. They are best used as bedding, edging, or container plants. Panicles of blue, pink, purple.

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Contributions from the United States National Herbarium, pp. These leaves cm long and 1.

Economic Impact Top of page A. For example, blue billygoat weed Ageratum houstonianum is one of only a few introduced species that have colonised undisturbed or relatively intact ageraum forest vegetation within Brisbane Forest Park. Johnson reports the species as escaping from gardens and becoming established in central Florida, Cuba, Jamaica, and Hawaii.

Avoid overhead watering and provide good air circulation to prevent the plant from powdery mildew. Fine Gardening – Issue Buy Ageratum houstonianum Floss Flower.

Click on images to enlarge. Light shade is tolerated in hot summer areas. Parasitology Research, 6: Another environmental weed, praxelis Praxelis clematideaand a native plant, vernonia Cyanthillium cinereumare also very similar to blue billygoat weed Ageratum houstonianum. Taxonomic studies of the genus Ageratum L. Roadsides, aageratum areas, areas of habitation.


Ageratum Houstonianum. The Blue Floss Flower. The Perfect Blue Annual.

Nakahara and Hilburn, Bases of bract appendages NA Bract cycle number there are three or more cycles of bracts there are houstojianum main cycles of bracts Bract margins there are few or no fine hairs along the bract margins Bract outer side hair type the bracts are hairy on their outer surfaces, with hairs having glands a swelling at the tip of the hair Bract outer side hairs the bracts are hairy on their outer surfaces Bract shape the main bracts are lanceolate widest above the base, then taper narrowly towards the tip Bract spines there is just one simple spine at the tip of the bract Bract texture the bracts appear leathery or hardened Bract tip extension appearance NA Bract tip extension agerahum there are projections from the bract tips Bract tip shape the tips of the bracts are acuminate tapered to a narrow point Bract agerratum 0.

Blue billygoat weed Ageratum houstonianum is regarded as an environmental weed in Queensland and New South Wales. It loves water but it is very forgiving if you forget occasionally. Warm temperate climate with dry winter Warm houstohianum temp. Weeds of Australia lists the following distinguishing characters: National Plant Germplasm System.

A study of the acaricidal properties of an essential oil extracted from the leaves of Ageratum houstonianum. To squeeze out every last bloom and extend the flowering season, always deadhead the flowers when they’ve ayeratum.

Ageratum houstonianum (Floss Flower)

Whiteflies can weaken the plant and cause the pointy leaves to yellow. Seed may also be sown directly in the garden after last frost date, however flowering season will sgeratum shorter late summer to frost. Each flower-head mm across has numerous tiny tubular flowers i.


It springs back easily if it’s been a bit dry. Two or three times a week for this plant, especially in summer.

Blue billygoat weed Ageratum houstonianum is often confused with another very similar species, billygoat weed Ageratum conyzoides. Its use as a garden plant is encouraged to attract butterflies and deter deer Cornell Garden-Based Learning, Ageratum has evolved a unique method of protecting itself from insects: It can be particularly invasive along waterways and in riparian vegetation Weeds of Australia, The species contains secondary metabolites that suppress the development of the juveniles of Meloidogyne haplaa nematode that causes significant damage and crop losses in temperate zones Thoden et al.

The qgeratum use of this species as a flower bed plant and the ease with which its small seeds are easily transported by wind and water makes A. Massachusetts not applicable S-rank: The narrow lanceolate bracts are pointed, denticulate only at the top and glandular hairy.

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