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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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Annual flowers for Canadian gardens. Up to 1 foot tall. This is particularly important when the plants are young since warm water seems to accelerate the growth of the plant.

Catalogue of the Seed Plants of the West Indies. Sheldon Navie branched clusters of flower-heads at the tips of the stems Photo: Care Grow in full sun to partial shade in fertile, moist but well-drained houtsonianum. The worldwide 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. Compact and reliable garden performer. Vernonia Cyanthillium cinereum leaves have finely-toothed i.

Excessive humidity can cause oedema, as reported by the Cornell Garden-Based Learning resources and plant nursery websites. Intercropping with aromatic plants hindered the occurrence of Aphis citricola in an apple orchard system by shifting predator-prey abundances. Aromatic plants of tropical central Africa. Root rot may occur in poorly drained soils. Bract resin the bracts have no resin or resin glands Leaf blade glands the leaf blades have no glandular translucent dots or scales Sap the sap houstoniaunm clear and watery.


Also covers those considered historical not seen in 20 years. Prefers rich soils with good drainage and consistent moisture throughout the growing season.

Ageratum Houstonianum. The Blue Floss Flower. A Gardener’s Delight.

An annual introduced from Mexico and Central America, Houston’s whiteweed is an escapee from cultivation in Massachusetts and possibly elsewhere. The herbicide diphenamid, applied to the soil reduces the growth of the species Adamson and Crossley, Sheldon Navie close-up showing the numerous tiny flowers in each flower-head Photo: Antirrhinum majus Snapdragon A colorful garden favorite!

Sheldon Navie paired lower leaves with slightly heart-shaped bases Photo: Weed Science Society of Indonesia, A study of the acaricidal properties of an essential oil extracted from the leaves of Ageratum houstonianum. Robinson, ; Johnson, ; Missouri Botanical Garden, Common, cultivated in gardens, moist and shaded situations and around settlements -Assam Present Introduced Invasive Barua et al.

Ageratum houstonianum (Floss Flower)

Genus name presumably comes from the Greek a meaning not and geras meaning old age because the flowers hold their color for a long time. The plant toxicosis has been so severe to even cause the death of cattle Noa et al.

Search our database of Plants. Johnson, ; Missouri Botanical Garden, Contributions from the Gray Herbarium of Harvard University, Ageratum is a Linnaean name derived from the Greek a notand geras old agereferring to the long-lasting nature of the flowers.

Continental climate houstpnianum dry summer Warm average temp.

Ageratum houstonianum is prone to becoming a rampant environmental weed when grown outside of its natural range. Zebu cattle have been reported to suffer from intoxication by grazing on A.


They have a soft, fuzzy appearance and attract butterflies.

A contribution of Bontoc ethnobotany. Nursery websites report the plant does not tolerate frost, although some state that the plants might survive, but with reduced to no flowering.

Floss Flower: How To Care For Ageratum Houstonianum –

Prompt deadheading of the ageratuj flowers is not necessary, but keeps a planting tidy and tends to promote a better uninterrupted bloom. Johnson, ; PIER, Noteworthy Characteristics Fast grower. Roadsides, waste areas, areas of habitation. The control methods referred to in this fact sheet should be used in accordance with the restrictions federal and state legislation, and local government laws directly or indirectly related to each control method.

Ageratum houstonianum Floss Flower.

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

Ageratum houstonianum toxicosis in Zebu cattle. Only plants will be removed from the collection.

Wikimedia Commons has media related to Ageratum houstonianum. Comments on the identity of Ageratum conyzoides L. If you prefer live aeratum, they are available from many nurseries.

Fine Gardening – Issue Although Palmer cites it as recently introduced in Hawaii, Fosberg collected the species at Honolulu inreporting it as escaped from cultivation.