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Useful Tropical Plants

Ageratum houstonianum

Mill.

Asteraceae

+ Synonyms

Ageratum conyzoides mexicanum (Sims) DC.

Ageratum mexicanum Sims

Ageratum pinetorum (L.O.Williams) R.M.King & H.Rob

Ageratum wendlandii Vilm.

Alomia pinetorum L.O.Williams.

Carelia houstoniana (Mill.) Kuntze

Common Name: Ageratum

Ageratum houstonianum
Flowering plant
Photograph by: Shepherd, R.C.H.
Image credit to Australian National Botanic Gardens
Ageratum houstonianum Ageratum houstonianum Ageratum houstonianum

General Information

Ageratum is a usually erect, and often much-branched, annual plant growing 30 - 100cm tall.
The plant is sometimes harvested from the wild for local medicinal use. Very ornamental, it is often grown in gardens[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].

Known Hazards

None known

Botanical References

72
Title
Manual of the Southeastern Flora.
Publication
 
Author
Small J.K.
Website
http://www.biodiversitylibrary.org
Publisher
University of N. Carolina Press.
Year
1933
ISBN
 
Description
Getting rather dated now, an immense work covering the flora of Southeastern N. America. No pictures, it is not for the casual reader. It can be downloaded from the Internet.
,
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
,
270
Title
Flora of N. America
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/fna/
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.

Range

C. America, north to south-western N. America - Mexico; Caribbean.

Habitat

Pine woods and cultivated ground[
72
Title
Manual of the Southeastern Flora.
Publication
 
Author
Small J.K.
Website
http://www.biodiversitylibrary.org
Publisher
University of N. Carolina Press.
Year
1933
ISBN
 
Description
Getting rather dated now, an immense work covering the flora of Southeastern N. America. No pictures, it is not for the casual reader. It can be downloaded from the Internet.
]. Disturbed sites, mainly coastal[
270
Title
Flora of N. America
Publication
 
Author
 
Website
http://flora.huh.harvard.edu/fna/
Publisher
 
Year
0
ISBN
 
Description
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.
]. Locally common in fields, roadsides and waste places at elevations up to 1,700 metres[
310
Title
Plant Resources of Southeast Asia
Publication
 
Author
 
Website
http://proseanet.org/
Publisher
 
Year
0
ISBN
 
Description
Lots of information on the uses of the plants of SE Asia.
].

Properties

Weed PotentialYes
Medicinal Rating *  *
Other Uses Rating *  *
HabitAnnual
Height0.40 m
PollinatorsLepidoptera
Cultivation StatusOrnamental, Wild

Cultivation Details

Tolerates temperatures down to between -5 and -10°c[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].
Grows well in ordinary garden soil[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
]. Requires a sheltered position in full sun[
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
].
Often grown as an ornamental, the plant has escaped from cultivation and become naturalised in many areas[
305
Title
Pacific Island Ecosystems at Risk
Publication
 
Author
 
Website
http://www.hear.org/pier/scientificnames/index.html
Publisher
 
Year
0
ISBN
 
Description
A very good website detailing weed species that have been introduced into the Pacific Islands.
].
The flowers are very attractive to butterflies[
30
Title
Butterflies and Moths in Britain and Europe.
Publication
 
Author
Carter D.
Publisher
Pan
Year
1982
ISBN
0-330-26642-x
Description
An excellent book on Lepidoptera, it also lists their favourite food plants.
].
The removal of dead flowers will extend the flowering season.

Edible Uses

None known

Medicinal

The juice of the plant is used externally to treat cuts and wounds[
272
Title
Plants and People of Nepal
Publication
 
Author
Manandhar. N. P.
Publisher
Timber Press. Oregon.
Year
2002
ISBN
0-88192-527-6
Description
Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.
].

Other Uses

The plant yields an insecticide[
310
Title
Plant Resources of Southeast Asia
Publication
 
Author
 
Website
http://proseanet.org/
Publisher
 
Year
0
ISBN
 
Description
Lots of information on the uses of the plants of SE Asia.
].

Propagation

Seed - surface sow. The seed usually germinates in 1 - 3 weeks at 20°c[
133
Title
Growing from Seed. Volume 1.
Publication
 
Author
Rice. G. (Editor)
Publisher
Thompson and Morgan.
Year
1987
ISBN
-
Description
Very readable magazine with lots of information on propagation.
]. When large enough to handle, prick the seedlings out and plant them when large enough.

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