AGEHO
Growth form
broadleaf
Biological cycle
annual
Habitat
terrestrial
synonym | Ageratum conyzoides subsp. houstonianum (Mill.) M.Sharma |
synonym | Ageratum conyzoides subsp. houstonianum (Mill.) Sahu |
synonym | Ageratum conyzoides var. houstonianum (Mill.) T.R.Sahu |
synonym | Ageratum conyzoides var. mexicanum (Sims) DC. |
synonym | Ageratum houstonianum f. houstonianum |
synonym | Ageratum houstonianum f. luteum B.L.Rob. |
synonym | Ageratum houstonianum f. niveum B.L.Rob. |
synonym | Ageratum houstonianum f. normale B.L.Rob. |
synonym | Ageratum houstonianum var. angustatum B.L.Rob. |
synonym | Ageratum houstonianum var. typicum B.L.Rob. |
synonym | Ageratum mexicanum f. caeruleum Voss |
synonym | Ageratum mexicanum f. lasseauxii (Carrière) Voss |
synonym | Ageratum mexicanum f. wendlandii Voss |
synonym | Ageratum mexicanum Sims |
synonym | Ageratum mexicanum Sweet |
synonym | Ageratum mexicanum Sweet [Illegitimate] |
synonym | Ageratum mexicanum var. majus Voss |
synonym | Ageratum mexicanum var. nanum Voss |
synonym | Ageratum mexicanum var. wendlandii Voss |
synonym | Ageratum pinetorum (L.O.Williams) R.King & H.Rob. |
synonym | Ageratum wendlandii Bailly |
synonym | Ageratum wendlandii Hort. ex Vilm. |
synonym | Ageratum wendlandii subsp. compactum |
synonym | Alomia pinetorum L.O.Williams |
synonym | Cacalia mentrasto Vell. |
synonym | Carelia houstoniana (Mill.) Kuntze |
Afrikaans |
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Chinese |
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Creoles and pidgins, French-based |
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English |
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Fijian |
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French |
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Hawaiian |
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Hindi |
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Italian |
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Malagasy |
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Portuguese |
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Spanish; Castilian |
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Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
China: Ageratum houstonianum flowers and fruits all year round.
Madagascar: Ageratum houstonianum flowers throughout the year, mainly from March to June.
Zimbabwe : Ageratum houstonianum flowers and fruits from October to May.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Ageratum houstonianum prefers damp and shady conditions. It grows along roadsides, in disturbed areas and along river banks.
China: Species present in meadows, roadsides, slopes in valleys, cultivated and naturalised, at altitudes of 100-1500 m.
Fiji: Occasionally cultivated and also naturalised at altitudes from sea level to 1,127m in open areas, along roadsides, river banks, and on slopes and ridges of cleared uplands.
Hawaii: Naturalised in a wide variety of disturbed habitats, particularly along tracks and roads, from 40 to 1,300 m.
Madagascar: The species thrives on usually quite fertile soils such as ferrallitic, more or less humid of the slopes and terraces, under a humid (eastern side of the island) and sub humid climate of upland, moist soil but well drained. Sunny or lightly shaded grounds, in cropping systems based on vegetables, cassava, slash and burned rainfed rice in extensive or semi-intensive system. Agro-ecological zones in Madagascar are the central highlands and the eastern side of the island.
Mauritius: Common in the sugar cane fields and on roadsides, especially in the per humid area.
New Guinea: Ageratum houstonianum is established in a few localities above 1000 m.
Reunion: Absent.
South Africa: Ageratum houstonianum is a crop weed.
West Indies: Ageratum houstonianum is mentioned as an ornamental plant but its presence in natural or agricultural environments remains to be confirmed.
Zimbabwe: Ageratum houstonianum grows along roadsides, in disturbed environments and beside watercourses, at altitudes of 1,000 to 1,700 metres.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Origin
Originally from Mexico, Central America and the Caribbean.
Worldwide distribution
South of center America, Southeast US, Southern Europe, Southern and Eastern Africa, South-West Indian Ocean, China, Japan, Australia, New Zealand and the Pacific Islands.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Global harmfulness
Ageratum houstonianum is a common weed of annual crops; can invade perennial crops such as sugar cane. Occasionally, there can be a significant problem for cotton where the achenes transported by wind contaminating the fiber. The seeds are also referred to stick in the throats of cows and can choke and kill them.
Local harmfulness
South Africa: Crop weed. Present in the provinces of Eastern Cape, Kwa-Zulu Natal, Limpopo and Mpumalanga. Considered as species of Category 1. Nemba - Category 1B
Madagascar: Fairly common with variable abundance in cassava crops, perennial crops, rice slashing and burning, vegetable crops, on roadsides and cultures.
Mauritius: Present but not abundant. It competes severely with young canes when present in large numbers.
Reunion: Absent.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Global management
Manual weeding of Ageratum houstonianum is not recommended because of its allergenic effects. Herbicides can be used in crops in pre-emergence and / or post-emergence directed.
Local management
South Africa: In Kruger National Park, Ageratum houstonianum is controlled by manual weeding
Madagascar: Use the angady weeding or manual weeding to fight against this weed in vegetable crops, cassava or potato, perennial crops and rice cultivation on slash burning. Soil moisture can limit the effectiveness of manual weeding; manual weeding can cause an allergy phenomenon.
Mauritius: Weeds can be controlled manually by uprooting or by herbicide application.
Reunion: Absent.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Herbarium pictures ReCOLNAT: https://explore.recolnat.org/search/botanique/simplequery=Ageratum%2520houstonianum
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Root | Root |
Kingdom | Plantae |
Phylum | Tracheophyta |
Class | Magnoliopsida |
Order | Asterales |
Family | Asteraceae |
Genus | Ageratum |
Species | Ageratum houstonianum Mill. |