03
Jul
2009
Ageratum houstonianum - rods
Flowers | Magnoliopsida

Scientific name - Ageratum houstonianum Miller 1822

Synonyms - Ageratum mexicanum Sims

Popular names - agerato, Ageratum, sharp blue, blue billygoat, Celestina azul, floss flower, rods.

Distribution and Habitat - native from Mexico and Central America. In Europe it is cultivated as ornamental plants in the 1800.

Description - herbaceous perennial. Stem erect or decumbenta, 30-100 cm tall, slightly hairy or glabra. Leaves ovat-triangulation, 2-7 x 1.5-6 cm, top acute-obtuse, margins regular soirees, hairy on both sides, petiole 5-30 mm long, hairy. Blossom corymb compound, branched, hairy, global capital, 6-8 mm diameter, involucre with bractei linear-lanceolata, 5 mm long, slightly hairy. Flowers blue-violet. Fruit achenes, 2 mm long, black, or slightly glabra hairy, white doll with 5 wires.

Growth rate --

Tolerante - semi-shade and wind. Do not stand temperatures below 14-15 ° C, frost and drought.

Required - easy land, rich in humus, with a little perlite to ensure good drainage. Species heliofila (exhibitions prefer sunny).

Management - is abundant and regular watering, do not let dry land for too long timo. During the flowering season it is advisable to fertilize in 15-20 days. Past flowers are blooming away to ensure a rich and continuing.

Propagation - by seeds, it looks like in February (under glass) or April-May (off). Germinate after 5-7 days. Are planted at 15-25 cm distance between plants.

Diseases and pests - afidele and white fly. Botrytis attack plants if they are poorly ventilated places with shade and position.

Partners garden - Amtirrhinum majus 'Rocket White', Argyranthemum frutescens, Dianthus plumarius, Lantana camara, Nicotiana sylvestris, paper Rudbeckia, Tagetes tenuifolia.

Cultivars - 'Adriatic' 10-15 cm tall, flowers blue. 'Bavaria' 25-30 cm tall, flowers bicolore, white and blue. 'Blue Bouquet' 35-45 cm tall, purple flowers open. 'Blue Danube' 20-30 cm tall, purple flowers open. 'Neptune Blue' 15-20 cm tall, blue-violet flowers. 'Southern Cross' 30 "high, bicolore flowers, blue and white. 'White Ball' 24 "high, white flowers.

Properties and Uses - ornamental species, grown as annual for borders, cut flowers, pots. Attract butterflies.

The essential oil of Ageratum houstonianum is used in the production of natural fungicides used against Blastomyces, Epidermophyton floccosum, Fusarium lateritium, Histoplama capsulatum, Trichophyton mentagrophytes, Trichophyton tonsurans, Trichophyton verrucosum, Trichophyton violaceum.

Curiosity -

References

Allan M. Armitage - Armitage's Garden Annuals - Timber Press, 2004

Carolyn Harstad, Jean lives - Got Shade? - Indiana University Press, 2003

Denise W. Adams - Restoring American Gardens - Timber Press, 2004

MK Rai, Donatella Mares - Plant derived Antimycotics - CRC Press, 2003

Suzanne McIntire & ndash, An American Cutting Garden - University of Virginia Press, 2005

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